Updated on 2024/02/01

写真a

 
KONO Yohei
 
Organization
Faculty of Science and Engineering Research Associate
Contact information
The inquiry by e-mail is 《here
Profile

研究分野は主に低次元量子スピン系の磁化、比熱をはじめとした低温物性測定。今後は超伝導、重い電子系との融合領域の研究も進めたい。

External link

Degree

  • 博士(理学) ( 東京大学 )

  • 修士(理学) ( 東京大学 )

Education

  • 2017.3
     

    The University of Tokyo   doctor course   completed

  • 2014.3
     

    The University of Tokyo   master course   completed

  • 2012.3
     

    The University of Tokyo   Faculty of Science   Department of Physics   graduated

Research History

  • 2020.4 - Now

    Chuo University   Faculty of Science and Engineering Department of Physics   Assistant Professor

  • 2019.4 - 2020.3

    Osaka Prefecture University

  • 2018.4 - 2019.3

    The University of Tokyo   The Institute for Solid State Physics

  • 2017.4 - 2018.3

    The University of Tokyo   The Institute for Solid State Physics

  • 2016.4 - 2017.3

    The University of Tokyo   The Institute for Solid State Physics

Professional Memberships

  • THE PHYSICAL SOCIETY OF JAPAN

Research Interests

  • 低次元量子スピン系

  • 磁性

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems  / 磁性

Papers

  • Magnetic properties of a spin-1/2 honeycomb lattice antiferromagnet Reviewed

    Y. Kono, T. Okabe, N. Uemoto, Y. Iwasaki, Y. Hosokoshi, S. Kittaka, T. Sakakibara, H. Yamaguchi

    Phys. Rev. B   101   014437 - 014437   2020.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society  

    DOI: 10.1103/PhysRevB.101.014437

    DOI: 10.1103/physrevb.101.014437

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  • Emergent critical phenomenon in spin-1/2 ferromagnetic-leg ladders: Quasi-one-dimensional Bose―Einstein condensate Reviewed

    Y. Kono, S. Kittaka, H. Yamaguchi, Y. Hosokoshi, T. Sakakibara

    Phys. Rev. B   100   054442-1 - 054442-8   2019.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society  

    DOI: 10.1103/PhysRevB.100.054442

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    Other Link: http://orcid.org/0000-0001-7613-3721

  • Quasi-one-dimensional Bose-Einstein condensation in the spin-1/2 ferromagnetic-leg ladder 3-I-V Reviewed

    Y. Kono, S. Kittaka, H. Yamaguchi, Y. Hosokoshi, T. Sakakibara

    Physical Review B   97 ( 10 )   100406-1 - 100406-5   2018.3

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    Quantum criticality of the spin-1/2 ferromagnetic-leg ladder 3-I-V [=3-(3-iodophenyl)-1,5-diphenylverdazyl] has been examined with respect to the antiferromagnetic to paramagnetic phase transition near the saturation field Hc. The phase boundary Tc(H) follows the power-law Tc(H) Hc-H for a wide temperature range. This characteristic behavior is discussed as a quasi-one-dimensional (quasi-1D) Bose-Einstein condensation, which is predicted theoretically for weakly coupled quasi-1D ferromagnets. Thus, 3-I-V provides the first promising candidate for this attractive prediction.

    DOI: 10.1103/PhysRevB.97.100406

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    Other Link: http://orcid.org/0000-0001-7613-3721

  • Three-dimensional Bose-Einstein condensation in the spin-12 ferromagnetic-leg ladder 3-Br-4-F-V Reviewed

    Yohei Kono, Hironori Yamaguchi, Yuko Hosokoshi, Toshiro Sakakibara

    PHYSICAL REVIEW B   96 ( 10 )   104439-1 - 104439-6   2017.9

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    The critical exponent of the phase boundary has been examined on the three-dimensional incommensurate ordering phase in the spin-1/2 ferromagnetic-leg ladder 3-Br-4-F-V [=3-(3-bromo-4-fluorophenyl)-1,5-diphenylverdazyl]. Using the temperature-window fitting technique, we obtained the critical exponents which agreed with the three-dimensional (3D) Bose-Einstein condensation (BEC) universality class at both sides of the lower critical field and the saturation field. 3-Br-4-F-V thus becomes a new member of the quantum magnets which prove the universality of the 3D BEC exponent.

    DOI: 10.1103/PhysRevB.96.104439

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    Other Link: http://orcid.org/0000-0001-7613-3721

  • Field-Induced Quantum Criticality and Universal Temperature Dependence of the Magnetization of a Spin-1/2 Heisenberg Chain Reviewed

    Y. Kono, T. Sakakibara, C. P. Aoyama, C. Hotta, M. M. Turnbull, C. P. Landee, Y. Takano

    PHYSICAL REVIEW LETTERS   114 ( 3 )   037202-1 - 037202-5   2015.1

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    High-precision dc magnetization measurements have been made on Cu(C4H4N2) (NO3)(2)in magnetic fields up to 14.7 T, slightly above the saturation field H-s = 13.97 T, in the temperature range from 0.08 to 15 K. The magnetization curve and differential susceptibility at the lowest temperature show excellent agreement with exact theoretical results for the spin-1/2 Heisenberg antiferromagnet in one dimension. A broad peak is observed in magnetization measured as a function of temperature, signaling a crossover to a low-temperature Tomonaga-Luttinger-liquid regime. With an increasing field, the peak moves gradually to lower temperatures, compressing the regime, and, at H-s, the magnetization exhibits a strong upturn. This quantum critical behavior of the magnetization and that of the specific heat withstand quantitative tests against theory, demonstrating that the material is a practically perfect one-dimensional spin-1/2 Heisenberg antiferromagnet.

    DOI: 10.1103/PhysRevLett.114.037202

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    Other Link: http://orcid.org/0000-0001-7613-3721

  • Modulation vector of the Fulde-Ferrell-Larkin-Ovchinnikov state in CeCoIn5 revealed by high-resolution magnetostriction measurements Reviewed

    Shunichiro Kittaka, Yohei Kono, Kaito Tsunashima, Daisuke Kimoto, Makoto Yokoyama, Yusei Shimizu, Toshiro Sakakibara, Minoru Yamashita, Kazushige Machida

    Phys. Rev. B   107   L220505   2023.6

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    DOI: 10.1103/PhysRevB.107.L220505

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  • Anomalous electromagnetic response in the spin-triplet superconductor UTe2 Reviewed

    Yusei Shimizu, Shunichiro Kittaka, Yohei Kono, Toshiro Sakakibara, Kazushige Machida, Ai Nakamura, Dexin Li, Yoshiya Homma, Yoshiki J. Sato, Atsushi Miyake, Minoru Yamashita, Dai Aoki

    Physical Review B   106 ( 21 )   214525   2022.12

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevb.106.214525

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.106.214525/fulltext

  • Anisotropy-driven quantum criticality in an intermediate valence system International journal

    Grbi{\'c}, Mihael S, {O\'}fFarrell, Eoin CT, Matsumoto, Yosuke, Kuga, Kentaro, Br, o, Manuel, K{\"u}chler, Robert, Nevidomskyy, Andriy H, Yoshida, Makoto, Sakakibara, Toshiro, Kono, Yohei, others

    Nature communications   13 ( 1 )   1 - 8   2022.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Nature Publishing Group  

    Intermetallic compounds containing f-electron elements have been prototypical materials for investigating strong electron correlations and quantum criticality (QC). Their heavy fermion ground state evoked by the magnetic f-electrons is susceptible to the onset of quantum phases, such as magnetism or superconductivity, due to the enhanced effective mass (m*) and a corresponding decrease of the Fermi temperature. However, the presence of f-electron valence fluctuations to a non-magnetic state is regarded an anathema to QC, as it usually generates a paramagnetic Fermi-liquid state with quasiparticles of moderate m*. Such systems are typically isotropic, with a characteristic energy scale T0 of the order of hundreds of kelvins that require large magnetic fields or pressures to promote a valence or magnetic instability. Here we show the discovery of a quantum critical behaviour and a Lifshitz transition under low magnetic field in an intermediate valence compound α-YbAlB4. The QC origin is attributed to the anisotropic hybridization between the conduction and localized f-electrons. These findings suggest a new route to bypass the large valence energy scale in developing the QC.

    DOI: 10.1038/s41467-022-29757-9

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  • Nature of field-induced antiferromagnetic order in Zn-doped CeCoIn5 and its connection to quantum criticality in the pure compound

    Yokoyama, Makoto, Honma, Yutoku, Oshima, Yoshiki, Rahmanto, Suzuki, Kohei, Tenya, Kenichi, Shimizu, Yusei, Aoki, Dai, Matsuo, Akira, Kindo, Koichi, Nakamura, Shota, Kono, Yohei, Kittaka, Shunichiro, Sakakibara, Toshiro

    Physical Review B   2022.2

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    DOI: 10.1103/PHYSREVB.105.054515

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  • Development of high-resolution capacitive Faraday magnetometers for sub-Kelvin region

    Yusei Shimizu, Yohei Kono, Tomoyoshi Sugiyama, Shunichiro Kittaka, Yasuyuki Shimura, Atsushi Miyake, Dai Aoki, Toshiro Sakakibara

    Rev. Sci. Instrum.   92 ( 12 )   123908 - 123908   2021.11

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    Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    DOI: 10.1063/5.0067759

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  • Gapped ground state in a spin-1/2 frustrated square lattice

    H. Yamaguchi, N. Uemoto, T. Okubo, Y. Kono, S. Kittaka, T. Sakakibara, T. Yajima, S. Shimono, Y. Iwasaki, Y. Hosokoshi

    Phys. Rev. B   104 ( 6 )   2021.8

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    DOI: 10.1103/PhysRevB.104.L060411

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  • Quantum critical phenomena in a spin-1/2 frustrated square lattice with spatial anisotropy

    H. Yamaguchi, Y. Iwasaki, Y. Kono, T. Okubo, S. Miyamoto, Y. Hosokoshi, A. Matsuo, T. Sakakibara, T. Kida, M. Hagiwara

    Phys. Rev. B   103 ( 22 )   2021.6

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    DOI: 10.1103/PhysRevB.103.L220407

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  • Field-Angle-Resolved Landscape of Non-Fermi-Liquid Behavior in the Quasi-Kagome Kondo Lattice CeRhSn

    S. Kittaka, Y. Kono, S. Tsuda, T. Takabatake, T. Sakakibara

    J. Phys. Soc. Jpn.   90 ( 6 )   064703 - 064703   2021.5

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    We have employed a magnetic field angle as a tuning parameter in a comprehensive measurement of the specific heat, magnetocaloric effect, and magnetization for the quasi-kagome Kondo lattice CeRhSn, which is considered to exhibit zero-field quantum criticality driven by geometrical frustration. By constructing the field-angle-resolved landscape of the entropy, we unexpectedly revealed that the non-Fermi-liquid nature survives up to a metamagnetic crossover field of roughly 3 T in the very narrow field-orientation range, close to the direction parallel to the quasi-kagome plane. We propose that spin fluctuations along the hexagonal c axis are the dominant driving force for the non-Fermi-liquid behavior because it is strongly suppressed by a magnetic-field component along the c axis. The multidimensional entropy landscape, which directly reflects the degeneracy of ground states, opens a new route for uncovering the nature of exotic phases in anisotropic systems.

    DOI: 10.7566/JPSJ.90.064703

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  • Magnetic Properties of a Mixed Spin-(1/2,5/2) Chain in (4-Cl-o-MePy-V)FeCl4

    Hironori Yamaguchi, Taiki Okita, Yoshiki Iwasaki, Yohei Kono, Yuko Hosokoshi, Takanori Kida, Akira Matsuo, Takashi Kawakami, Masayuki Hagiwara

    Journal of the Physical Society of Japan   90 ( 6 )   064707 - 064707   2021.5

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    Publishing type:Research paper (scientific journal)   Publisher:Physical Society of Japan  

    DOI: 10.7566/JPSJ.90.064707

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  • Low-energy magnetic excitations in the mixed spin-(1/2, 5/2) chain

    H. Yamaguchi, Y. Iwasaki, Y. Kono, T. Okita, A. Matsuo, M. Akaki, M. Hagiwara, Y. Hosokoshi

    Phys. Rev. B   102 ( 6 )   060408 - 060408   2020.8

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    DOI: 10.1103/PhysRevB.102.060408

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  • Experimental Realization of Lieb-Mattis Plateau in a Quantum Spin Chain

    Hironori Yamaguchi, Taiki Okita, Yoshiki Iwasaki, Yohei Kono, Nao Uemoto, Yuko Hosokoshi, Takanori Kida, Takashi Kawakami, Akira Matsuo, Masayuki Hagiwara

    Sci. Rep.   10 ( 1 )   9193 - 9193   2020.6

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1038/s41598-020-66336-8

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    Other Link: http://www.nature.com/articles/s41598-020-66336-8

  • Synthesis and Magnetic Properties of M2+Ti4+ Substituted Ba12Fe28Ti15O84

    N. Yasuda, S. Kittaka, Y. Kono, T. Sakakibara, K. Kakizaki, K. Kamishima

    J. Magn. Soc. Jpn.   44 ( 3 )   70 - 74   2020.5

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    Publishing type:Research paper (scientific journal)   Publisher:The Magnetics Society of Japan  

    DOI: 10.3379/msjmag.2005R004

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  • Magnetic properties of a spin-2 antiferromagnet with metal-radical hybrid spins

    Y. Iwasaki, T. Okabe, N. Uemoto, Y. Kono, Y. Hosokoshi, S. Nakamura, S. Kittaka, T. Sakakibara, M. Hagiwara, T. Kawakami, H. Yamaguchi

    Phys. Rev. B   101 ( 17 )   174412 - 174412   2020.5

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    DOI: 10.1103/PhysRevB.101.174412

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  • Superconductivity in PtSbS with a Noncentrosymmetric Cubic Crystal Structure Reviewed

    Mizutani Ryosuke, Okamoto Yoshihiko, Nagaso Hayate, Yamakawa Youichi, Takatsu Hiroshi, Kageyama Hiroshi, Kittaka Shunichiro, Kono Yohei, Sakakibara Toshiro, Takenaka Koshi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   88 ( 9 )   2019.9

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    We report the synthesis, electronic properties, and electronic structure of ullmannite-type PtSbS, which has a cubic crystal structure without space inversion symmetry. Electrical resistivity and magnetization measured at low temperatures suggested that this compound is a bulk superconductor with a superconducting transition temperature of T-c = 0.15 K. First principles calculations indicated that Fermi surfaces of PtSbS include strongly nested hole pockets, which can make this compound interesting if they contribute to the emergence of superconductivity.

    DOI: 10.7566/JPSJ.88.093709

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  • S = 1/2 ferromagnetic Heisenberg chain in a verdazyl-based complex Reviewed

    N. Uemoto, Y. Kono, S. Kittaka, T. Sakakibara, T. Yajima, Y. Iwasaki, S. Miyamoto, Y. Hosokoshi, H. Yamaguchi

    Phys. Rev. B   99 ( 9 )   094418-1 - 094418-6   2019.3

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    We present a model compound for the S = 1/2 ferromagnetic Heisenberg chain composed of the verdazyl-based complex [Zn(hfac)(2)][4-Cl-o-Py-V-(4-F)(2)]. Ab initio MO calculations indicate a predominant ferromagnetic interaction forming an S = 1/2 ferromagnetic chain. The magnetic susceptibility and specific heat indicate a phase transition to an antiferromagnetic (AF) order due to the finite interchain couplings. We explain the magnetic susceptibility and magnetization curve above the phase-transition temperature based on the S = 1/2 ferromagnetic Heisenberg chain. The magnetization curve in the ordered phase is described by a conventional AF two-sublattice model. Furthermore, the obtained magnetic specific heat reproduces the almost temperature-independent behavior of the S = 1/2 ferromagnetic Heisenberg chain. In the low-temperature region, the magnetic specific heat exhibits a root T dependence, which is attributed to the energy dispersion in the ferromagnetic chain.

    DOI: 10.1103/PhysRevB.99.094418

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    Other Link: http://orcid.org/0000-0001-7613-3721

  • Anisotropic magnetic-field response of quantum critical fluctuations in Ni-doped CeCoIn5 Reviewed

    Makoto Yokoyama, Kohei Suzuki, Kenichi Tenya, Shota Nakamura, Yohei Kono, Shunichiro Kittaka, Toshiro Sakakibara

    Physical Review B   2019.2

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    DOI: 10.1103/physrevb.99.054506

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  • Field-induced quantum magnetism in the verdazyl-based charge-transfer salt [o-MePy-V-(p-Br)2]FeCl4 Reviewed

    Y. Iwasaki, T. Kida, M. Hagiwara, T. Kawakami, Y. Kono, S. Kittaka, T. Sakakibara, Y. Hosokoshi, H. Yamaguchi

    Phys. Rev. B   98   224411-1 - 224411-8   2018.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society  

    DOI: 10.1103/PhysRevB.98.224411

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    Other Link: http://orcid.org/0000-0001-7613-3721

  • Low-Temperature Magnetization Measurements with Precise Two-Axis Alignment of the Sample Orientation Reviewed

    Shota Nakamura, Akira Kasahara, Shunichiro Kittaka, Yohei Kono, Yoshichika Ōnuki, Toshiro Sakakibara

    Journal of the Physical Society of Japan   87   114001   2018.11

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    DOI: 10.7566/jpsj.87.114001

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  • Magnetization study on the ising ferromagnet URhGe with high-precision angle-resolved magnetic field near the hard axis Reviewed

    Nakamura S, Sakakibara T, Shimizu Y, Kittaka S, Kono Y, Haga Y, Pospíšil J, Yamamoto E

    Progress in Nuclear Science and Technology   5   123 - 127   2018.11

  • Investigation of the tricritical point of the ising ferromagnet URhGe by angle-resolved measurements Reviewed

    Nakamura Shota, Kittaka Shunichiro, Sakakibara Toshiro, Shimizu Yusei, Kono Yohei, Haga Yoshinori, Pospisil Jiri, Yamamoto Etsuji

    AIP ADVANCES   8 ( 10 )   101305-1 - 101305-5   2018.10

  • Field-enhanced quantum fluctuation in an S=1/2 frustrated square lattice Reviewed

    H. Yamaguchi, Y. Sasaki, T. Okubo, M. Yoshida, T. Kida, M. Hagiwara, Y. Kono, S. Kittaka, T. Sakakibara, M. Takigawa, Y. Iwasaki, Y. Hosokoshi

    Physical Review B   98   094402   2018.9

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    DOI: 10.1103/PhysRevB.98.094402

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  • Magnetic-field-induced quantum phase in S = 1/2 frustrated trellis lattice Reviewed

    Hironori Yamaguchi, Daichi Yoshizawa, Takanori Kida, Masayuki Hagiwara, Akira Matsuo, Yohei Kono, Toshiro Sakakibara, Yusuke Tamekuni, Hirotsugu Miyagai, Yuko Hosokoshi

    Journal of the Physical Society of Japan   87 ( 4 )   043701-1 - 043701-5   2018.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Physical Society of Japan  

    We present a new model compound of an S = 1=2 frustrated system with ferromagnetic interaction composed of verdazyl radical β-2,3,5-Cl3-V. The ab initio molecular orbital calculation indicates the formation of an S = 1=2 trellis lattice in which zigzag chains and ladders with ferromagnetic rung interaction are two-dimensionally coupled. We observe a field-induced successive phase transition and an unconventional change in the magnetization curve near the saturation field, accompanied by T 2 dependence on the magnetic specific heat. A two-dimensional spin-nematic state attributed to the ferromagnetic rung interactions is a possible candidate for the ground state in high-field regions.

    DOI: 10.7566/JPSJ.87.043701

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  • Magnetic Properties and Magnetic Phase Diagrams of Trigonal DyNi3Ga9 Reviewed

    H. Ninomiya, Y. Matsumoto, S. Nakamura, Y. Kono, S. Kittaka, T. Sakakibara, K. Inoue, S. Ohara

    Journal of the Physical Society of Japan   2017.11

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    DOI: 10.7566/JPSJ.86.124704

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  • Randomness-induced quantum spin liquid on honeycomb lattice Reviewed

    Hironori Yamaguchi, Masataka Okada, Yohei Kono, Shunichiro Kittaka, Toshiro Sakakibara, Toshiki Okabe, Yoshiki Iwasaki, Yuko Hosokoshi

    SCIENTIFIC REPORTS   7 ( 1 )   16144-1 - 16144-6   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATURE PUBLISHING GROUP  

    Quantum entanglement in magnetic materials is expected to yield a quantum spin liquid (QSL), in which strong quantum fluctuations prevent magnetic ordering even at zero temperature. This topic has been one of the primary focuses of condensed-matter science since Anderson first proposed the resonating valence bond state in a certain spin-1/2 frustrated magnet in 1973. Since then, several candidate materials featuring frustration, such as triangular and kagome lattices, have been reported to exhibit liquid-like behavior. However, the mechanisms that stabilize the liquid-like states have remained elusive. Here, we present a QSL state in a spin-1/2 honeycomb lattice with randomness in the exchange interaction. That is, we successfully introduce randomness into the organic radialbased complex and realize a random-singlet (RS) state (or valence bond glass). All magnetic and thermodynamic experimental results indicate the liquid-like behaviors, which are consistent with those expected in the RS state. Our results suggest that the randomness or inhomogeneity in the actual systems stabilize the RS state and yield liquid-like behavior.

    DOI: 10.1038/s41598-017-16431-0

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  • Wing structure in the phase diagram of the Ising ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements Reviewed

    Shota Nakamura, Toshiro Sakakibara, Yusei Shimizu, Shunichiro Kittaka, Yohei Kono, Yoshinori Haga, Jiri Pospisil, Etsuji Yamamoto

    PHYSICAL REVIEW B   96 ( 9 )   094411-1 - 094411-9   2017.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    High-precision angle-resolved dc magnetization and magnetic torque studies were performed on a singlecrystalline sample of URhGe, an orthorhombic Ising ferromagnet with the c axis being the magnetization easy axis, in order to investigate the phase diagram around the ferromagnetic (FM) reorientation transition in a magnetic field near the b axis. We have clearly detected a first-order transition in both the magnetization and the magnetic torque at low temperatures, and determined detailed profiles of the wing structure of the three-dimensional T-Hb-Hc phase diagram, where H-c and H-b denote the field components along the c and the b axes, respectively. The quantum wing critical points are located at mu H-0(c) similar to +/- 1.1 T and mu H-0(b) similar to 13.5 T. Two second-order transition lines at the boundaries of the wing planes rapidly tend to approach each other with increasing temperature up to similar to 3 K. Just at the zero conjugate field (H-c = 0), however, a signature of the first-order transition can still be seen in the field derivative of the magnetization at similar to 4 K, indicating that the tricritical point exists in a rather high temperature region above 4 K. This feature of the wing plane structure is consistent with the theoretical expectation that three second-order transition lines merge tangentially at the tricritical point.

    DOI: 10.1103/PhysRevB.96.094411

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    Other Link: http://orcid.org/0000-0001-7613-3721

  • Neutron Scattering Study in Breathing Pyrochlore Antiferromagnet Ba3Yb2Zn5O11 Reviewed

    T. Haku, M. Soda, M. Sera, K. Kimura, J. Taylor, S. Itoh, T. Yokoo, Y. Matsumoto, D. Yu, R. A. Mole, T. Takeuchi, S. Nakatsuji, Y. Kono, T. Sakakibara, L. J. Chang, T. Masuda

    Journal of Physics: Conference Series   828 ( 1 )   012018-1 - 012018-5   2017.4

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Physics Publishing  

    Inelastic neutron scattering (INS) study on breathing pyrochlore antiferromagnet Ba3Yb2Zn5O11 is presented. Observed crystalline electric field (CEF) excitations are explained by a Hamiltonian of Kramers ion Yb3+ of which the local symmetry exhibits C3v point group symmetry. The magnetic susceptibility is consistently reproduced by the energy scheme of the CEF excitations. The INS spectra in the low-energy range are quantitatively explained by spin-1/2 single-tetrahedron model having XXZ anisotropy and Dzyaloshinskii-Moriya interaction. This model has a two-fold degeneracy of the lowest-energy state per tetrahedron and well reproduces the bulk properties at T ≥ 0.5K. At lower temperatures, however, we observe a broad maximum in the heat capacity around 63 mK, demonstrating that a unique quantum ground state is selected due to extra perturbations.

    DOI: 10.1088/1742-6596/828/1/012018

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  • Thermodynamic Investigation of Metamagnetic Transitions and Partial Disorder in the Quasi-Kagome Kondo Lattice CePdAl Reviewed

    Kenji Mochidzuki, Yusei Shimizu, Akihiro Kondo, Shota Nakamura, Shunichiro Kittaka, Yohei Kono, Toshiro Sakakibara, Yoichi Ikeda, Yosikazu Isikawa, Koichi Kindo

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   86 ( 3 )   034709-1 - 034709-5   2017.3

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    Low-temperature (T) thermodynamic properties of the quasi-Kagome antiferromagnet CePdAl ( T-N = 2.7 K) in magnetic fields (B) were studied by magnetization and specific-heat C(T, B) measurements. The unusual magnetic phase diagram, including three thermodynamic phases I-III and crossover anomalies, has been obtained. In the low-field phase I, the existence of the partial Kondo screening state on one-third of the Ce sites is supported from the following thermodynamic view points: (i) the appearance of a paramagnetic moment with one-third of the full moment around 3 T and (ii) the occurrence of an entropy release of similar to 0.3R ln 2 around the observed crossover. On the other hand, a strong enhancement of C/T was found around the point where T-N( B) meets the boundary of phase III, indicating the possible presence of a tricritical point. Furthermore, it is suggested that the three metamagnetic transitions at B-mi (i = 1, 2. 3) originate from successive increments of the Ising-type magnetic moment along the c-axis. In the high-field region above 20 T, the behavior of f electrons can be roughly described by the crystal-electric-field model.

    DOI: 10.7566/JPSJ.86.034709

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  • Comparison With Ground States of Frustrated Quantum Spin Chain Systems A(2)Cu(2)Mo(3)O(12) (A = Rb and Cs) Reviewed

    Akio Fujimura, Yukio Yasui, Yudai Yanagisawa, Ichiro Terasaki, Yohei Kono, Shunichiro Kittaka, Toshiro Sakakibara

    IEEE TRANSACTIONS ON MAGNETICS   52 ( 7 )   1 - 3   2016.7

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    We have measured the magnetic and thermal properties below 2 K of a quasi-1-D frustrated spin-1/2 system Cs2Cu2Mo3O12 called CuO2 ribbon chain systems in order to investigate its magnetic ground state. In the temperature dependence of the specific heat divided by temperature, C/T-T, we found a sharp peak structure at T-N = 1.85 K, which indicates the existence of a phase transition. Considering the behavior of the magnetization and specific heat, it is found that Cs2Cu2Mo3O12 exhibits an antiferromagnetic transition at TN = 1.85 K, and its magnetic ground state is an antiferromagnetic long-range ordered one. The determined ground state of Cs2Cu2Mo3O12 significantly contrasts with a nonmagnetic ground state of isostructural compound Rb2Cu2Mo3O12. We discuss the origins of difference of the magnetic ground states between Rb2Cu2Mo3O12 and Cs2Cu2Mo3O12.

    DOI: 10.1109/TMAG.2016.2517091

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  • Low-energy excitations and ground-state selection in the quantum breathing pyrochlore antiferromagnet Ba3Yb2Zn5O11 Reviewed

    T. Haku, K. Kimura, Y. Matsumoto, M. Soda, M. Sera, D. Yu, R. A. Mole, T. Takeuchi, S. Nakatsuji, Y. Kono, T. Sakakibara, L. -J. Chang, T. Masuda

    PHYSICAL REVIEW B   93 ( 22 )   1 - 5   2016.6

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    We study low-energy excitations in the quantum breathing pyrochlore antiferromagnet Ba3Yb2Zn5O11 by a combination of inelastic neutron scattering (INS) and thermodynamical property measurements. The INS spectra are quantitatively explained by spin-1/2 single-tetrahedron model having XXZ anisotropy and Dzyaloshinskii-Moriya interactions. This model has a twofold degeneracy of the lowest-energy state per tetrahedron and well reproduces the magnetization curve at 0.5 K and heat capacity above 1.5 K. At lower temperatures, however, we observe a broad maximum in the heat capacity around 63 mK, demonstrating that a unique quantum ground state is selected due to extra perturbations with an energy scale smaller than the instrumental resolution of INS.

    DOI: 10.1103/PhysRevB.93.220407

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  • Quadrupole Order in the Frustrated Pyrochlore Tb2+xTi2-xO7+y Reviewed

    H. Takatsu, S. Onoda, S. Kittaka, A. Kasahara, Y. Kono, T. Sakakibara, Y. Kato, B. Fak, J. Ollivier, J. W. Lynn, T. Taniguchi, M. Wakita, H. Kadowaki

    PHYSICAL REVIEW LETTERS   116 ( 21 )   217201-1 - 217201-6   2016.5

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    A hidden order that emerges in the frustrated pyrochlore Tb2+xTi2-xO7+y with T-c = 0.53 K is studied using specific heat, magnetization, and neutron scattering experiments on a high-quality single crystal. Semiquantitative analyses based on a pseudospin-1/2 Hamiltonian for ionic non-Kramers magnetic doublets demonstrate that it is an ordered state of electric quadrupole moments. The elusive spin liquid state of the nominal Tb2Ti2O7 is most likely a U(1) quantum spin-liquid state.

    DOI: 10.1103/PhysRevLett.116.217201

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    Other Link: http://orcid.org/0000-0001-7613-3721

  • Unconventional S=2 alternating chain realized by a metal-radical hybrid-spin approach Reviewed

    H. Yamaguchi, Y. Shinpuku, Y. Kono, S. Kittaka, T. Sakakibara, M. Hagiwara, T. Kawakami, K. Iwase, T. Ono, Y. Hosokoshi

    PHYSICAL REVIEW B   93 ( 11 )   115145-1 - 115145-7   2016.3

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    We demonstrate an advanced spin-system design using a hybrid spin consisting of a strongly coupled metal ion and verdazyl radical. Ab initio calculation, magnetization, and ESR measurements evidenced the first realization of an S = 2 ferromagnetic-antiferromagnetic alternating chain with Ising anisotropy in a Mn-verdazyl complex [Mn(hfac)(2)]center dot(o-Py-V) [hfac = 1,1,1,5,5,5-hexafluoroacetylacetonate; o-Py-V = 3-(2-pyridyl)-1,5-diphenylverdazyl]. Furthermore, we find an anomalous change in magnetization at 1/4 of the saturation value, which is probably a manifestation of the quantum nature of the system.

    DOI: 10.1103/PhysRevB.93.115145

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  • Field-induced phase transitions and magnetoferroelectricity in the perfect triangular lattice antiferromagnet RbFe(MoO4)(2) in a vertical magnetic field Reviewed

    Hiroyuki Mitamura, Ryuta Watanuki, Norimichi Onozaki, Yuta Amou, Yohei Kono, Shunichiro Kittaka, Yasuyuki Shimura, Isao Yamamoto, Kazuya Suzuki, Toshiro Sakakibara

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   400   70 - 72   2016.2

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    We performed electric polarization P, dielectric constant epsilon and magnetization M measurements on the perfect triangular-lattice antiferromagnet RbFe(MoO4)(2) in high magnetic fields B applied along the c-axis. Whereas M(B) at T=1.5 K monotonically increases with B up to the saturation at B-s = 21 T, P(B) disappears about 14 T, far below the saturation point. In a field range 13 <= B <= 14T, the temperature variation of e shows a double peak structure below 2.8 K, indicating two successive transitions. These results strongly suggest the presence of a new high-field phase; the magnetic structure changes from a low-field conical state having chirality to a high-field coplanar non-collinear structure without chirality. The obtained phase diagram is in agreement with a theoretical prediction on XY-like Heisenberg spin triangular lattice antiferromagnets. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2015.08.013

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  • Pauli-limited superconductivity and antiferromagnetism in the heavy-fermion compound CeCo(In1-xZnx)5 Reviewed

    Makoto Yokoyama, Hiroaki Mashiko, Ryo Otaka, Yumi Sakon, Kenji Fujimura, Kenichi Tenya, Akihiro Kondo, Koichi Kindo, Yoichi Ikeda, Hideki Yoshizawa, Yusei Shimizu, Yohei Kono, Toshiro Sakakibara

    Physical Review B - Condensed Matter and Materials Physics   92 ( 18 )   2015.11

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    We report on the anisotropic properties of Pauli-limited superconductivity (SC) and antiferromagnetism (AFM) in the solid solutions CeCo(In1-xZnx)5 (x≤0.07). In CeCo(In1-xZnx)5, the SC transition temperature Tc is continuously reduced from 2.3 K (x=0) to ∼1.4 K (x=0.07) by doping Zn, and then the AFM order with the transition temperature of TN∼2.2K develops for x larger than ∼0.05. The present thermal, transport, and magnetic measurements under magnetic field B reveal that the substitution of Zn for In yields little change of low-temperature upper critical field μ0Hc2 for both the tetragonal a and c axes, while it monotonically reduces the SC transition temperature Tc. In particular, the magnitudes of μ0Hc2 at the nominal Zn concentration of x=0.05 (measured Zn amount of ∼0.019) are 11.8 T for B||a and 4.8 T for B||c, which are as large as those of pure compound though Tc is reduced to 80% of that for x=0. We consider that this feature originates from a combination of both an enhanced AFM correlation and a reduced SC condensation energy in these alloys. It is also clarified that the AFM order differently responds to the magnetic field, depending on the field directions. For B||c, the clear anomaly due to the AFM transition is observed up to the AFM critical field of ∼5 T in the thermodynamic quantities, whereas it is rapidly damped with increasing B for B||a. We discuss this anisotropic response on the basis of a rich variety of AFM modulations involved in the Ce115 compounds.

    DOI: 10.1103/PhysRevB.92.184509

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  • First-Order Ferromagnetic Transition of Quantum Spin Ice System Yb2Ti2O7 Reviewed

    Yukio Yasui, Noriaki Hamachi, Yohei Kono, Shunichiro Kittaka, Toshiro Sakakibara

    SPIN   5 ( 2 )   1540002-1 - 1540002-6   2015.6

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    The neutron diffraction and measurements of specific heat and magnetization were carried out on single crystals of a quantum spin ice system Yb2Ti2O7. The thermal hysteresis loops of temperature dependence of the magnetization and neutron diffraction intensity indicate a first-order ferromagnetic transition, where the used single crystals are confirmed to have a sharp peak structure in the specific heat (C)-temperature (T) curve at T-C similar to 0.2 K. The magnetic structure analysis of neutron diffraction results revealed that the Yb3+ moments have a ferromagnetic collinear structure along [001] directions with ordered moment value 1.1 +/- 0.1 mu(B) at 0.03 K. The mechanism of ferromagnetic transition of Yb2Ti2O7 will be discussed.

    DOI: 10.1142/S2010324715400020

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  • Quantum phase near the saturation field in the S=1/2 frustrated spin ladder Reviewed

    H. Yamaguchi, H. Miyagai, Y. Kono, S. Kittaka, T. Sakakibara, K. Iwase, T. Ono, T. Shimokawa, Y. Hosokoshi

    PHYSICAL REVIEW B   91 ( 12 )   125104-1 - 125104-5   2015.3

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    We present low-temperature specific heat and magnetization measurements of the S = 1/2 organic spin ladder 3-I-V [3-(3-iodophenyl)-1,5-diphenylverdazyl]. Ab initio molecular orbital calculations indicate the existence of an intraladder diagonal interaction J(diag) and three types of interladder interactions. The ferromagnetic J(diag) induces frustration in the spin ladder, which has an essential contribution to the ground state. The obtained phase diagram exhibits a low-field three-dimensional order and a nontrivial phase near the saturation field. The absence of successive phase transition with decreasing temperature and the anomalous behavior of the magnetization curve near the saturation field suggest that these two phases are longitudinal spin-density-wave and spin-multipolar orders, respectively.

    DOI: 10.1103/PhysRevB.91.125104

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  • S=1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain in a zinc-verdazyl complex Reviewed

    Hironori Yamaguchi, Yasuhiro Shinpuku, Tokuro Shimokawa, Kenji Iwase, Toshio Ono, Yohei Kono, Shunichiro Kittaka, Toshiro Sakakibara, Yuko Hosokoshi

    PHYSICAL REVIEW B   91 ( 8 )   085117-1 - 085117-6   2015.2

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    We successfully synthesized the zinc-verdazyl complex [Zn(hfac)(2)]center dot(o-Py-V) [hfac = 1,1,1,5,5,5-hexafluoroacetylacetonate; o-Py-V = 3-(2-pyridyl)-1,5-diphenylverdazyl], which is an ideal model compound with an S = 1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain (F-AF AHC). Ab initio molecular-orbital (MO) calculations indicate that two dominant interactions J(F) and J(AF) form the S = 1 2 F-AF AHC in this compound. The magnetic susceptibility and magnetic specific heat of the compound exhibit thermally activated behavior below approximately 1 K. Furthermore, its magnetization curve is observed up to the saturation field and directly indicates a zero-field excitation gap of 0.5 T. These experimental results provide evidence for the existence of a Haldane gap. We successfully explain the results in terms of the S = 1 2 F-AF AHC through quantum Monte Carlo calculations with vertical bar J(AF)/J(F)vertical bar = 0.22. The ab initio MO calculations also indicate a weak AF interchain interaction J' and that the coupled F-AF AHCs form a honeycomb lattice. The J' dependence of the Haldane gap is calculated, and the actual value of J' is determined to be less than 0.01 vertical bar J(F)vertical bar.

    DOI: 10.1103/PhysRevB.91.085117

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  • Low Temperature Magnetic Properties of a New Quasi-one-dimensional Organic Magnet alpha-2-Cl-4-F-V Reviewed

    Yohei Kono, Shunichiro Kittaka, Hironori Yamaguchi, Yuko Hosokoshi, Toshiro Sakakibara

    20TH INTERNATIONAL CONFERENCE ON MAGNETISM, ICM 2015   75   679 - 686   2015

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    We examine low-temperature magnetic properties of a new verdazyl radical crystal alpha-2-Cl-4-FV. Molecular orbital calculations predict that this material is a spin-1/2 quasi-one-dimensional antiferromagnet; the exchange interaction is strongest in the chains along the b axis, whereas there are three interchain coupling parameters, the ratio of which are 0.06 similar to 0.14 to the intrachain. The magnetization curve at 0.1 K shows gapless behavior like conventional one-dimensional quantum spin systems and saturates at about 5 T. A peak is observed in the temperature dependence of the heat capacity at 0 T, indicating that a three-dimensional ordering occurs at about 0.2 K. On the other hand, the temperature dependence of the magnetization at various magnetic fields shows an anomaly similar to that observed in many of gapped spin systems. This behavior is attributed to the highly frustrated nature of the interchain interactions.

    DOI: 10.1016/j.phpro.2015.12.088

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  • Magnetization Study of the Quantum Critical Behavior of the One Dimensional Spin-1/2 Heisenberg Antiferromagnet CuPzN Reviewed

    Kono Y, Sakakibara T, Aoyama C. P, Turnbull M. M, Landee C. P, Takano Y

    JPS Conf. Proc.   3   012015-1 - 012015-5   2014.6

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    Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

    DOI: 10.7566/JPSCP.3.012015

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  • Fine-Tuning of Magnetic Interactions in Organic Spin Ladders Reviewed

    Hironori Yamaguchi, Hirotsugu Miyagai, Tokuro Shimokawa, Kenji Iwase, Toshio Ono, Yohei Kono, Naoki Kase, Koji Araki, Shunichiro Kittaka, Toshiro Sakakibara, Takashi Kawakami, Kouichi Okunishi, Yuko Hosokoshi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 3 )   033707-1 - 033707-4   2014.3

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    We have succeeded in synthesizing two types of new organic radical crystals 3-I-V [= 3-(3-iodophenyl)-1,5-diphenylverdazyl] and 3-Br-4-F-V [= 3-(3-bromo-4-fluorophenyl)-1,5-diphenylverdazyl]. Their crystal strucutures are found to be isomorphous to that of previously reported spin ladder 3-Cl-4-F-V. Through the quantitative analysis of their molecular arrangements and magnetic properties, we confirm that these materials form ferromagnetic chain-based spin ladders with slightly modulated magnetic interactions. These results present the first quantitative demonstration of the fine-tuning of magnetic interactions in the molecular-based materials.

    DOI: 10.7566/JPSJ.83.033707

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  • Possible Evolution of Antiferromagnetism in Zn-Doped Heavy-Fermion Superconductor CeCoIn5 Reviewed

    Makoto Yokoyama, Kenji Fujimura, Sara Ishikawa, Masashi Kimura, Takeshi Hasegawa, Ikuto Kawasaki, Kenichi Tenya, Yohei Kono, Toshiro Sakakibara

    J. Phys. Soc. Jpn.   83 ( 3 )   033706-1 - 033706-5   2014.2

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    We have succeeded in growing single crystals of the heavy-fermion
    superconductor CeCo(In1-xZnx)5 with x<=0.07. Measurements of specific heat,
    electrical resistivity, dc magnetization and ac susceptibility revealed that
    the superconducting (SC) transition temperature Tc decreases from 2.25 K (x=0)
    to 1.8 K (x=0.05) by doping Zn into CeCoIn5. Furthermore, these measurements
    indicate a development of a new ordered phase below T_o ~ 2.2 K for x=>0.05,
    characterized by the reduced magnetization and electrical resistivity in the
    ordered phase, and the enhancement of specific heat at T_o. This phase
    transition can be also recognized by the shoulder-like anomaly seen at H_o ~ 55
    kOe in the field variations of the magnetization at low temperatures, which is
    clearly distinguished from the superconducting critical fields Hc2=49 kOe for
    x=0.05 and 42 kOe for x=0.07. We suggest from these results that the
    antiferromagnetic (AFM) order is generated by doping Zn, and the interplay
    between the SC and AFM orders is realized in CeCo(In1-xZnx)5.

    DOI: 10.7566/JPSJ.83.033706

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  • Quasi-one-dimensional S=1/2 Heisenberg antiferromagnetic chain consisting of the organic radical p-Br-V Reviewed

    Kenji Iwase, Hironori Yamaguchi, Toshio Ono, Yuko Hosokoshi, Tokuro Shimokawa, Yohei Kono, Shunichiro Kittaka, Toshiro Sakakibara, Akira Matsuo, Koichi Kindo

    PHYSICAL REVIEW B   88 ( 18 )   184431-1 - 184431-5   2013.11

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    We have succeeded in synthesizing single crystals of an organic radical p-Br-V [3-(4-bromophenyl)-1,5-diphenylverdazyl]. The dominant intermolecular interactions forming a one-dimensional spin chain are deduced from the molecular packing in the crystal, and the ab initio molecular orbital calculation also indicates such an exchange network. We analyzed the magnetic susceptibility, magnetization curve, and magnetic specific heat through the quantum Monte Carlo method and successfully explained them as being attributed to an S = 1/2 Heisenberg antiferromagnetic chain. Furthermore, we have found an unexpected successive phase transition in the specific heats, which indicates the formation of a noncollinear magnetic structure induced by frustration.

    DOI: 10.1103/PhysRevB.88.184431

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  • Various regimes of quantum behavior in an S=1/2 Heisenberg antiferromagnetic chain with fourfold periodicity Reviewed

    H. Yamaguchi, T. Okubo, K. Iwase, T. Ono, Y. Kono, S. Kittaka, T. Sakakibara, A. Matsuo, K. Kindo, Y. Hosokoshi

    PHYSICAL REVIEW B   88 ( 17 )   174410-1 - 174410-5   2013.11

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    We have succeeded in synthesizing single crystals of the verdazyl radical beta-3-(2,6-dichlorophenyl)-1,5-diphenylverdazyl. The ab initio molecular orbital calculation indicates the formation of an S = 1/2 Heisenberg antiferromagnetic chain with fourfold magnetic periodicity consisting of three types of exchange interactions. We successfully explain the magnetic and thermodynamic properties based on the expected spin model by using the quantum Monte Carlo method. Furthermore, we reveal that the alternating and unique Ising ferromagnetic chains become effective in the specific field regions and observe a cooperative phenomenon caused by the magnetic order and quantum fluctuations. These results demonstrate that the verdazyl radical could form an unconventional spin model with interesting quantum behavior and provide a way to study a variety of quantum spin systems.

    DOI: 10.1103/PhysRevB.88.174410

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  • ハニカム格子系における特異な内部磁場と磁場誘起量子物性

    岩崎義己, 山口博則, 細越裕子, 川上貴資, 河野洋平, 橘高俊一郎, 榊原俊郎, 木田孝則, 萩原政幸

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019

  • URhGeのb軸方向近傍の極低温比熱・磁気熱量効果測定

    中村翔太, 橘高俊一郎, 河野洋平, 榊原俊郎, 清水悠晴, 芳賀芳範, POSPISIL Jiri, 山本悦嗣

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   ROMBUNNO.23pK504‐3   2018.3

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    J-GLOBAL

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  • 強磁性超伝導体UCoGeにおける極低温磁場回転比熱測定

    中村翔太, 橘高俊一郎, 清水悠晴, 清水悠晴, 河野洋平, 榊原俊郎, 青木大, 青木大, 仲村愛, 本多史憲, FLOUQUET Jacques

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   ROMBUNNO.21aF21‐4   2017.9

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    J-GLOBAL

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  • UCoGeの容易軸方向磁場下における磁化と比熱の測定

    中村翔太, 河野洋平, 清水悠晴, 橘高俊一郎, 榊原俊郎, 青木大, 青木大, 仲村愛, 本多史憲, FLOUQUET Jacques

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   ROMBUNNO.20PBL‐3 - 2061   2016.3

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    DOI: 10.11316/jpsgaiyo.71.1.0_2061

    CiNii Books

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  • 21aAL-5 Anomalous-logT dependence of Specific heat NdO_<1-x>F_xBiS_2 Superconductor

    Mita M, Asano T, Kono Y, Nakamura S, Kittaka S, Sakakibara T, Higashinaka R, Matsuda T. D, Aoki Y

    日本物理学会講演概要集   71 ( 1 )   2158 - 2158   2016.3

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    DOI: 10.11316/jpsgaiyo.71.1.0_2158

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  • 21pBM-5 Single crystal growth and physical properties of heavy fermion antiferromagnet YbNi_2Si_2

    Matsumoto Y, Nakamura Y, Ohara S, Haga Y, Fisk Zachary, Kono Y, Nakamura S, Kittaka S, Sakakibara T

    Meeting Abstracts of the Physical Society of Japan   71 ( 0 )   2301 - 2301   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2301

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  • The heavy fermion state in hexagonal Ce2Pt6Ga15

    Matsumoto Yuji, Ueda Takuya, Ohara Shigeo, Kono Yohei, Nakamura Shota, Kittaka Shunichiro, Sakakibara Toshiro, Uwatoko Yoshiya

    Meeting Abstracts of the Physical Society of Japan   71   2208 - 2208   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_2208

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  • Field-induced Quantum Critical Phenomena in Spin-1/2 Organic Ferro-leg Ladder 3-I-V

    Kono Y., Yamaguchi H., Hosokoshi Y., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   71   737 - 737   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_737

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  • 22aPS-19 Magnetic phase diagram of SmTr_2Zn_<20>(Tr = Rh, Ir) by means of magnetic and transport properties

    Tanahashi M., Adachi K., Sasahara T., Kase N., Nakano T., Takeda N., Kono Y., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   71   2413 - 2413   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2413

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  • 19aPS-42 Magnetic Behavior and Magnetic Structure of CuO_2 Ribbon System A_2Cu_2Mo_3O_<12>(A=Rb, Cs)

    Fujimura A., Yasui Y., Kono Y., Kittaka S., Sakakibara T., Igawa N., Matsukawa T., Yoshida Y., Hoshikawa A., Ishigaki T.

    Meeting Abstracts of the Physical Society of Japan   71   1049 - 1049   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_1049

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  • 19aPS-70 Magnetic property of quantum spin ice system Yb_2Ti_2O_7

    Hamachi N., Yasui Y., Kono Y., Kittaka S., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   71   1076 - 1076   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_1076

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  • 19aBL-6 Low-temperature heat capacity in the heavy-fermion superconductor Ube_<13> under high magnetic fields

    Shimizu Y., Kittaka S., Kono Y., Sakakibara T., Haga Y., Yamamoto E., Amitsuka H., Machida K.

    Meeting Abstracts of the Physical Society of Japan   71   1963 - 1963   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_1963

    CiNii Books

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  • Low-temperature high-sensitivity magnetization for the non-Fermi-liquid heavy-fermion superconductor UBe13

    Shimizu Y., Kono Y., Kittaka S., Haga Y., Yamamoto E., Amitsuka H., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   71   1754 - 1754   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_1754

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  • High-sensitivity dc magnetization study for the heavy-fermion antiferromagnetic superconductor UPd2Al3 at very low temperatures

    Shimizu Y., Kittaka S., Kono Y., Nakamura S., Sakakibara T., Aoki D.

    Meeting Abstracts of the Physical Society of Japan   71   1753 - 1753   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_1753

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  • Magnetization Measurements of URhGe in Magnetic Feilds along the Hard Axis

    Nakamura Shota, Kono Yohei, Kittaka Shunichiro, Sakakibara Toshiro, Shimizu Yusei, Haga Yoshinori, Pospíšil Jiří, Yamamoto Etsuji

    Meeting Abstracts of the Physical Society of Japan   71   1759 - 1759   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_1759

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  • High-field and low temperature phase and non-Fermi-liquid behavior in CeCo(In,Zn)5

    Mashiko H., Yokoyama M., Tenya K., Kondo A., Kindo K., Nakamura S., Kono Y., Shimizu Y., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   71   2095 - 2095   2016

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  • 20pPSB-27 Specific heat in magnetic field of heavy-fermion antiferromagnet YbNi_2Si_2

    Nakamura Y, Matsumoto Y, Ohara S, Kono Y, Nakamura S, Kittaka S, Sakakibara T, Haga Y, Fisk Zachary

    Meeting Abstracts of the Physical Society of Japan   71 ( 0 )   2130 - 2130   2016

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  • 21aBD-11 Field-induced Quantum Critical Phenomena in Spin-1/2 Organic Ferro-leg Ladders

    Kono Y., Kittaka S., Yamaguchi H., Hosokoshi Y., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   71   1229 - 1229   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_1229

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  • Low-Energy Excitations and Ground State Selection in Quantum Breathing Pyrochlore Antiferromagnet Ba3Yb2Zn5O11

    Haku T., Kimura K., Matsumoto Y., Soda M., Sera S., Yu D., Mole R. A., Takeuchi T., Nakatsuji S., Kono Y., Sakakibara T., Chang L. -J., Masuda T.

    Meeting Abstracts of the Physical Society of Japan   71   905 - 905   2016

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  • 20pPSB-6 Low-temperature properties of heavy-fermion superconductor Ce(Co1_<1-x>Ni_x)In_5

    Otaka R., Yokoyama M., Mashiko H., Tenya K., Ikeda Y., Shimizu Y., Kono Y., Yoshizawa H., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   71   2111 - 2111   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2111

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  • 21aPS-110 μSR measurement of quantum spin ice system Yb_2Ti_2O_7

    Hamachi N., Yasui Y., Kono Y., Kittaka S., Sakakibara T., Chang L. J., Onoda S., Watanabe I.

    Meeting Abstracts of the Physical Society of Japan   70   1038 - 1038   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_1038

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  • 21pPSA-47 Validation of One Dimensionality of the Spin-1/2 Antiferromagnetic Chain CuPzN via Low-temperature and High-magnetic-field DC Magnetization Measurements

    Kono Y., Sakakibara T., Hotta C., Turnbull M. M., Landee C. P., Takano Y.

    Meeting Abstracts of the Physical Society of Japan   70   1119 - 1119   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_1119

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  • 22aPS-94 Low temperature measurements of the anti-ferromagnetic compound SmT_2Zn_<20> (T=Rh, Ir)

    Tanahashi M., Adachi K., Sasahara T., Kase N., Nakano T., Takeda N., Kono Y., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   2184 - 2184   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_2184

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  • 17aPS-11 Magnetic field versus temperature phase diagram of the heavy-fermion superconductor CeCo(In_<1-x>Zn_x)_5

    Mashiko H., Yokoyama M., Sakon Y., Tenya K., Kondo A., Kindo K., Kono Y., Shimizu Y., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   70   1809 - 1809   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_1809

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  • 16aPS-51 Low-temperature physical properties of new metal-verdazyl complexs

    Okada M., Yamaguchi H., Ono T., Hosokoshi Y., Kono Y., Kittaka S., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   70   756 - 756   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_756

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  • 16aPS-45 Study of Quantum Criticality in Ferro-leg Ladders of Verdazyl Radical Crystals

    Kono Y., Kittaka S., Yamaguchi H., Hosokoshi Y., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   70   750 - 750   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_750

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  • 22aPS-118 Singlet ground state in tetragonal PrZn_<11>

    Ninomiya Hiroki, Sato Takaaki, Matsumoto Yuji, Ohara Shigeo, Kono Yohei, Kittaka Shunichiro, Sakakibara Toshiro

    Meeting Abstracts of the Physical Society of Japan   70   2207 - 2207   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_2207

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  • 21pPSA-52 Low temperature physical property of charge-transfer complex consisting of verdazyl radical and TCNQ

    Sasaki Y., Yamaguchi H., Ono T., Hosokoshi Y., Kono Y., Kittaka S., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   70   1122 - 1122   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_1122

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  • 18pPSB-19 Magnetization measurements of Bi single crystal at very low temperatures

    Nakamura S, Kono Y, Kittaka S, Sakakibara T, Behnia K

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   1127 - 1127   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_1127

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  • 21aPS-99 Low temperature physical properties of the honeycomb bilayer lattice compound m-Ph-(VpCl)_2, consisting of ferro- and antiferromagnetic interactions

    Iwase K., Yamaguchi H., Ono T., Kono Y., Sakakibara T., Matsuo A., Kindo K., Noguchi S., Iida K., Ishida T., Hosokoshi Y.

    Meeting Abstracts of the Physical Society of Japan   70   1027 - 1027   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_1027

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  • 24aBE-11 Magnetic Response of the Heavy-Electron Compound UBe_<13> : Normal-State Magnetization in High-Field Region and Magnetic Anomaly in Superconducting Mixed State

    Shimizu Y., Kono Y., Sakakibara T., Kittaka S., Haga Y., Yamamoto E., Amitsuka H.

    Meeting Abstracts of the Physical Society of Japan   70   2350 - 2350   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_2350

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  • 21aBB-7 Upper critical field of heavy-fermion superconductor CeCo(In_<1-x>Zn_x)_5

    Yokoyama M., Fujimura K., Kawasaki I., Tenya K., Kono Y., Sakakibara T., Ikeda Y., Yoshizawa H., Kondo A., Kindo K.

    Meeting Abstracts of the Physical Society of Japan   70   1951 - 1951   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_1951

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  • 21aAH-1 Magnetic phase diagrams of Cs_2Cu_2Mo_3O_<12> below 2K with CuO_2 ribbon chains

    Fujimura A., Yasui Y., Igawa N., Yoshida Y., Ishigaki T., Kono Y., Kittaka S., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   70   967 - 967   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_967

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  • 24aBJ-11 Investigation of the long-range order of Tb_<2+x>Ti_<2-x>O_<7+y> by means of magnetization measurements

    Takatsu H., Wakita M., Taniguchi T., Kadowaki H., Kasahara A., Kono Y., Kittaka S., Sakakibara T.

    Meeting Abstracts of the Physical Society of Japan   70   1240 - 1240   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_1240

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  • 8aPS-105 Superconducting Symmetry, Magnetic Anomaly, and Non-Fermi-Liquid State of Heavy-Electron Compound UBe_<13>

    Shimizu Y., Kittaka S., Kono Y., Sakakibara T., Haga Y., Yamamoto E., Amitsuka H., Tsutsumi Y., Machida K.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   382 - 382   2014.8

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  • 7aPS-127 Low-Temperature physical property of S=2 Mn Complex o-Py-V・Mn(hfac)_2

    Shimpuku Y., Yamaguchi H., Ono T., Hosokoshi Y., Kono Y., Kittaka S., Sakakibara T., Kawakami T.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   261 - 261   2014.8

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  • 9aPS-55 Magnetostriction and thermal expansion measurements of Cd_2Os_2O_7

    Mitamura H., Yamaura J., Kono Y., Kittaka S., Sakakibara T., Hiroi Z.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   416 - 416   2014.8

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  • 7pBK-1 Field-orientation dependence of the specific heat of non-centrosymmetric superconductor CePt_3Si

    Kittaka S., Kono Y., Sakakibara T., Bauer Ernst

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   343 - 343   2014.8

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  • 7pBK-2 Superconductivity and magnetism in Zn-doped heavy-fermion CeCoIn_5

    Yokoyama M., Fujimura K., Kawasaki I., Tenya K., Kono Y., Sakakibara T., Ikeda Y., Yoshizawa H.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   343 - 343   2014.8

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  • 8pBC-10 Low-temperature Properties of a New Spin-ladder Organic Antiferromagnet α-2-Cl-4-F-V

    Kono Y., Kittaka S., Sakakibara T., Yamaguchi H., Hamada R., Hosokoshi Y.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   295 - 295   2014.8

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  • 27aPS-82 New quantum phase of a spin-ladder material with ferromagnetic interactions

    Miyagai H., Yamaguchi H., Ono T., Shimokawa T., Yoshida M., Takigawa H., Kono Y., Kittaka S., Sakakibara T., Okunishi K., Okubo T., Kawakami T., Hosokoshi Y.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   494 - 494   2014.3

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  • 28aAY-12 Low-temperature physical properties of ferromagnetic chain-based spin ladder 3-I-V

    Yamaguchi H., Miyagai H., Ono T., Kono Y., Kittaka S., Sakakibara T., Shimokawa T., Hosokoshi Y.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   515 - 515   2014.3

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  • 28pAY-6 The formation of the honeycomb lattice by the metal complex with verdazyl radical

    Shimpuku Y., Yamaguchi H., Ono T., Shimokawa T., Kawakami T., Kono Y., Kittaka S., Sakakibara T., Hosokoshi Y.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   520 - 520   2014.3

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  • 27aPS-74 Magnetic phase diagrams of A_2Cu_2Mo_3O_<12>(A=Rb, Cs) below 2K with CuO_2 ribbon chains

    Fujimura A., Yasui Y., Okamura T., Terasaki I., Iguchi S., Sasaki T., Hase M., Hagihala M., Masuda T., Kono Y., Sakakibara T.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   492 - 492   2014.3

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  • 27aPS-81 Magnetization Study of a New One-dimensional Organic Antiferromagnet α-2-Cl-4-F-V at Low Temperatures

    Kono Y., Sakakibara T., Yamaguchi H., Hamada R., Hosokoshi Y.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   493 - 493   2014.3

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  • 27aPS-90 Magnetic phase diagrams of triangular antiferromagnets Ba_3MTa_2O_9 (M=Ni & Co)

    Ono T., Tominaga H., Yamaguchi H., Kono Y., Kittaka S., Sakakibara T., Hosokoshi Y.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   496 - 496   2014.3

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  • 4倍周期磁気状態を持つ新規一次元磁性体の低温物性

    山口博則, 小野俊雄, 木田孝則, 萩原政幸, 大久保毅, 松尾晶, 金道浩一, 河野洋平, 橘高俊一郎, 榊原俊郎, 下川統久朗, 細越裕子

    日本物理学会講演概要集   68 ( 2 )   431 - 431   2013.8

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  • A novel magnetic phase of a perfect triangular lattice antiferromagnet RbFe(MoO_4)_2 in high magnetic fields

    Mitamura H., Kono Y., Watanuki R., Amou Y., Onozaki N., Kittaka S., Shimura Y., Sakakibara T., Suzuki K.

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   373 - 373   2013.8

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  • Quantum Criticality of spin-1/2 quasi-one-dimensional chain Heisenberg antiferromagnet CuPzN

    Kono Y., Sakakibara T., Aoyama C.P., Turnbull M.M., Landee C.P., Takano Y.

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   430 - 430   2013.8

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  • Criteria for the presence of the spin-chirality-driven ferroelectricity on a perfect triangular lattice antiferromagnet

    Mitamura H., Watanuki R., Amou Y., Onozaki N., Kittaka S., Kono Y., Shimura T., Sakakibara T., Suzuki K.

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   450 - 450   2013.8

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  • Low-temperature physical properties of a new spin-ladder material with ferromagnetic interactions

    Miyagai H., Yamaguchi H., Iwase K., Ono T., Shimokawa T., Kono Y., Kittaka S., Sakakibara T., Hosokoshi Y.

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   385 - 385   2013.8

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  • 26aPS-86 Low-temperature magnetization measurements of spin-1/2 one-dimensional chain Heisenberg antiferromagnet CuPzN

    Kono Y., Sakakibara T., Aoyama C. P., Landee C. P., Turnbull M. M., Takano Yasumasa

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   518 - 518   2013.3

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  • 18aPSA-65 Low-temperature magnetization measurements of one single crystal of spin-1/2 kagome antiferromagnet volborthite

    Kono Y., Sakakibara T., Ishikawa H., Okamoto Y., Yamaura J., Hiroi Z.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   392 - 392   2012.8

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Presentations

  • Verification of the Rotational Magnetic Grüneisen Ratio in the Heavy-fermion Metal YbRh2Si2

    2024.1 

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  • Study for the realization of precise quantitative ac specific-heat measurements under high-pressure and low-temperature environment.

    Y. Kono, K. Tsuji, K. Kato, M. Takeuchi, K. Kitagawa, K. Matsubayashi, Y. Uwatoko, T. Sakakibara, S.Kittaka

    2023.9 

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    Event date: 2023.9    

    Language:Japanese   Presentation type:Poster presentation  

    File: 18pPSA-38_gaiyo.pdf

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  • Towards the realisation of precise quantitative measurements of AC specific heat under hydrostatic pressure

    2023.8 

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  • Correlation between quantum critical phenomena and anisotropy in YbRh2Si2 revealed by the magnetic field angle-resolved specific-heat measurements.

    Yohei Kono, Gérard Laperto, Yusei Shimizu, Dai Aoki, Toshiro Sakakibara, Shunichiro Kittaka

    2023.6 

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  • N/A Invited

    842nd ASRC Seminar  2023.5 

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  • Field-angle-resolved Magnetocaloric Effect and Entropy Landscape of of YbRh2Si2

    Yohei Kono, Gérard Lapertot, Yusei Shimizu, Dai Aoki, Toshiro Sakakibara, Shunichiro Kittaka

    2023.3 

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    File: 23aH1-3_gaiyo.pdf

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  • YbRh2Si2 の磁場角度分解比熱と磁気熱量効果測定

    河野 洋平, Gérard Lapertot, 清水 悠晴, 青木 大, 榊原 俊郎, 橘高 俊一郎

    日本物理学会 2022年秋季大会  2022.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Field-angle-resolved Specific-heat Measurements of YbRh2Si2

    Yohei Kono, G{\'e}rard Lapertot, Yusei Shimizu, Dai Aoki, Toshiro Sakakibara, Shunichiro Kittaka

    29th International Conference on Low Temperature Physics (LT29)  2022.8 

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  • Field-angle-resolved Specific-heat Measurements of YbRh2Si2 in the Quantum Critical Region

    Yohei Kono, Gérard Lapertot, Yusei Shimizu, Dai Aoki, Toshiro Sakakibara, Shunichiro Kittaka

    2022.3 

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  • Detection of a first-order superconducting transition in Sr2RuO4 by ultra-high-resolution magnetostriction measurements

    Yohei Kono, Shunichiro Kittaka, Toshiro Sakakibara, Naoki Kikugawa, Taichi Terashima, Shinya Uji, Dmitry Sokolov, Kazushige Machida

    The International Conference in Strongly Correlated Electrons systems  2021.9 

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    Event date: 2021.9 - 2021.10

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  • Low-temperature properties of a new verdazyl-radical-based quasi-two-dimensional quantum magnet

    Y. Kono, H. Yamaguchi, Y. Hosokoshi, T. Sakakibara, S. Kittaka

    2021.9 

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  • 熱力学量からみたSr2RuO4の上部臨界磁場近傍の超伝導状態

    河野 洋平, 橘高 俊一郎, 榊原 俊郎, 菊川 直樹, 寺嶋 太一, 宇治 進也, Dmitry Sokolov, 町田一成

    日本物理学会第76回年次大会  2021.3 

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    Presentation type:Oral presentation (general)  

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  • ボンドランダムネスを有する新規スピン1/2ハニカム格子錯体の低温物性

    河野 洋平, 橘高 俊一郎, 榊原 俊郎, 山口 博則, 細越 裕子

    日本物理学会2020年秋季大会  2020.9 

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    Presentation type:Oral presentation (general)  

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  • Low-temperature Physical Properties of Verdazyl-radical-based Low-dimensional Quantum Magnets

    Y. Kono, N. Uemoto, H. Yamaguchi, D. Motoki, S. Kittaka, T, Sakakibara, Y. Hosokoshi

    2019.9 

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  • スピン 1/2 ハニカム様格子系 [Zn(hfac)2](4-Cl-o-Py-V) の極低温物性

    河野洋平, 上本菜央, 山口博則, 細越裕子, 榊原俊郎

    日本物理学会第 74 回年次大会  2019.3 

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  • フェルダジルラジカル系スピ ン 1/2 フェロレッグラダーにおける量子臨界現象の普遍性

    河野洋平, 橘高俊一郎, 榊原俊郎, 山口博則, 細越裕子

    日本物理学会2018年秋季大 会  2018.9 

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  • Quasi-one-dimensional Bose-Einstein Condensation in Spin-1/2 Ferromagnetic-leg Ladder Organic Magnets International conference

    Y. Kono, S. Kittaka, H. Yamaguchi, Y. Hosokoshi, T. Sakakibara

    International Conference on Magnetism  2018.7 

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  • スピン 1/2 有機フェロレッグラダー 3-Cl-4-F-V の量子臨界性

    河野洋平, 山口博則, 細越裕子, 榊原俊郎

    日本物理学会第 73 回年次大会  2018.3 

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  • スピン 1/2 有機フェロレッグ ラダー物質の磁気熱量効果測定

    河野洋平, 橘高俊一郎, 榊原俊郎, 山口博則, 細越裕子

    日本物理学会2017年秋季大会  2017.9 

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    日本物理学会2016年秋季大会  2016.9 

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    日本物理学会第 71 回年次大会  2016.3 

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    International Conference on Magnetism  2015.7 

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    日本物理学会第 70 回年次大会  2015.3 

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    日本物理学会第 69 回年次大会  2014.3 

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    the International Conference on Strongly Correlated Electron Systems  2013.8 

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    日本物理学会第 68 回年次大会  2013.3 

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    日本物理学会2012年秋季大会  2012.9 

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