Quantum phases and quantum excitations in spin systems

• Project/Area Number: 17H01142
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Tanaka Hidekazu 東京工業大学, 理学院, 教授 (80188325)
• Co-Investigator(Kenkyū-buntansha): 栗田 伸之 東京工業大学, 理学院, 助教 (80566737)
• Project Period (FY): 2017-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥44,460,000 (Direct Cost: ¥34,200,000、Indirect Cost: ¥10,260,000); Fiscal Year 2021: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000); Fiscal Year 2020: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000); Fiscal Year 2019: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000); Fiscal Year 2018: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000); Fiscal Year 2017: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
• Keywords: スピン系 / 量子相転移 / 量子相 / 磁気励起 / フラストレーション / 量子効果 / 新物質

Outline of Final Research Achievements

We clarified a magnetic phase diagram, spin structures in magnetic fields, and the structure of magnetic excitations in a spin-1/2 triangular-lattice Heisenberg-like antiferromagnet Ba3CoSb2O9. We also synthesized several triangular-lattice quantum antiferromagnets. We determined their crystal structures and observed quantum magnetization plateaus at 1/3 of the saturation magnetization. We investigated magnetic excitations in Ba2CoTeO6 composed of a spin-1/2 triangular-lattice Heisenberg-like antiferromagnet and an Ising-like antiferromagnet and established magnetic excitations universal in the spin-1/2 triangular-lattice Heisenberg antiferromagnet. We studied magnetic excitations in a spin-1/2 kagome-lattice antiferromagnet Cs2Cu3SnF12 in detail and elucidated the excitation continuum characteristic of the spin-1/2 kagome-lattice Heisenberg antiferromagnet.

Academic Significance and Societal Importance of the Research Achievements

磁性体は磁石や変圧器或いは磁気ヘッドのように我々の身の回りで多く用いられている。磁性体の示す性質はミクロな磁石である電子のスピンが担っている。本来，スピンは量子力学的性質を強く示すものであるが，殆どの磁性体の性質はスピンを古典的なベクトルのように考えて理解することができる。本研究では，スピンの量子力学的性質が強く現れる磁性体を開拓し，これらが低温・強磁場・高圧中で示す顕著な量子現象を観測し，その機構の解明を行なった。本研究で明らかになった磁性体の量子現象は直ちに実用化には結びつくものではないが，現在注目されているスピントロニクスや量子計算のデバイスへの応用につながることが期待できる。

Research Products

• [Int'l Joint Research] KAIST(韓国)
• [Int'l Joint Research] Max Planck Institute/Helmholtz-Zentrum Berlin(ドイツ)
• [Int'l Joint Research] Sun Yat-Sen University(中国)
• [Int'l Joint Research] LNCMI / CNRS(フランス)
• [Int'l Joint Research] Mahidol University(タイ)
• [Int'l Joint Research] Oak Ridge National Laboratory/National High Magnetic Field Laboratory(米国)
• [Int'l Joint Research] Bragg Institute, ANSTO(オーストラリア)
• [Int'l Joint Research] Helmholtz-Zentrum Berlin/Dresden High Magnetic Field Laboratory/Max Planck Institute(ドイツ)
• [Int'l Joint Research] Mahidol University(タイ)
• [Int'l Joint Research] University of Indonesia(インドネシア)
• [Int'l Joint Research] Bragg Institute, ANSTO(オーストラリア)
• [Int'l Joint Research] Mahidol University(タイ)
• [Int'l Joint Research] Helmholtz-Zentrum Berlin/Dresden High Magnetic Field Laboratory(ドイツ)
• [Int'l Joint Research] Oak Ridge National Laboratory/National High Magnetic Field Laboratory(米国)
• [Int'l Joint Research] Bragg Institute, ANSTO(オーストラリア)
• [Int'l Joint Research] Mahidol University(タイ)
• [Int'l Joint Research] Helmholtz-Zentrum Berlin/Dresden High Magnetic Field Laboratory(ドイツ)
• [Int'l Joint Research] Paul Scherrer Institute(スイス)
• [Int'l Joint Research] Bragg Institute(オーストラリア)
• [Int'l Joint Research] Mahidol University/Songkhla Rajabhat University(タイ)
• [Int'l Joint Research] NIST Center for Neutron Research(米国)
• [Journal Article] Thermodynamic Evidence for a Field-Angle Dependent Majorana Gap in a Kitaev Spin Liquid (2022)
  • Author(s): O. Tanaka, Y. Mizukami, R. Harasawa, K. Hashimoto, K. Hwang, N. Kurita, H. Tanaka, S. Fujimoto, Y. Matsuda, E.-G. Moon, and T. Shibauchi
  • Journal Title: Nat. Phys. Volume: 18 Issue: 4 Pages: 429-435
  • DOI: 10.1038/s41567-021-01488-6
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnons and spinons in Ba2CoTeO6: A composite system of isolated spin-1/2 triangular Heisenberg-like and frustrated honeycomb Ising-like antiferromagnets (2022)
  • Author(s): Y. Kojima, N. Kurita, H. Tanaka and K. Nakajima
  • Journal Title: Phys. Rev. B Volume: 105 Issue: 2
  • DOI: 10.1103/physrevb.105.l020408
  • Peer Reviewed
• [Journal Article] Contrasting magnetic structures in SrLaCuSbO6 and SrLaCuNbO6: spin-1/2 square-lattice J1－J2 Heisenberg antiferromagnets (2022)
  • Author(s): M. Watanabe, N. Kurita, H. Tanaka, W. Ueno, K. Matsui, T. Goto and M. Hagihala
  • Journal Title: Phys. Rev. B Volume: 105 Issue: 5 Pages: 1-12
  • DOI: 10.1103/physrevb.105.054414
  • Peer Reviewed
• [Journal Article] Robustness of the thermal Hall effect close to half-quantization in a field-induced spin liquid state (2022)
  • Author(s): J. A. N. Bruin, R. R. Claus, Y. Matsumoto, N. Kurita, H. Tanaka and H. Takagi
  • Journal Title: Nat. Phys. Volume: 18 Issue: 4 Pages: 401-405
  • DOI: 10.1038/s41567-021-01501-y
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Structures of magnetic excitations in the spin-1/2 kagome-lattice antiferromagnets Cs2Cu3SnF12 and Rb2Cu3SnF12 (2022)
  • Author(s): M. Saito, R. Takagishi, N. Kurita, M. Watanabe, H. Tanaka, R. Nomura, Y. Fukumoto, K. Ikeuchi, and R. Kajimoto
  • Journal Title: Phys. Rev. B Volume: 105 Issue: 6 Pages: 1-15
  • DOI: 10.1103/physrevb.105.064424
  • Peer Reviewed
• [Journal Article] Continuous control of classical-quantum crossover by external high pressure in the coupled chain compound CsCuCl3 (2021)
  • Author(s): Yamamoto Daisuke、Sakurai Takahiro、Okuto Ryosuke、Okubo Susumu、Ohta Hitoshi、Tanaka Hidekazu、Uwatoko Yoshiya
  • Journal Title: Nature Communications Volume: 12 Issue: 1 Pages: 1-9
  • DOI: 10.1038/s41467-021-24542-6
  • NAID: 120007125724
  • Peer Reviewed / Open Access
• [Journal Article] Half-integer quantized anomalous thermal Hall effect in the Kitaev material candidate α-RuCl ₃ (2021)
  • Author(s): Yokoi T.、Ma S.、Kasahara Y.、Kasahara S.、Shibauchi T.、Kurita N.、Tanaka H.、Nasu J.、Motome Y.、Hickey C.、Trebst S.、Matsuda Y.
  • Journal Title: Science Volume: 373 Issue: 6554 Pages: 568-572
  • DOI: 10.1126/science.aay5551
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Coupled spin-12 antiferromagnetic chain Cs2LiRuCl6 with partially disordered crystal lattice (2021)
  • Author(s): Watanabe Kazumitsu、Kurita Nobuyuki、Tanaka Hidekazu、Sugiyama Haruki、Uekusa Hidehiro、Diaz-Ortega Ismael F.、Nojiri Hiroyuki
  • Journal Title: Physical Review B Volume: 103 Issue: 6
  • DOI: 10.1103/physrevb.103.064419
  • Peer Reviewed
• [Journal Article] Crossover critical behavior and magnetic entropy change of La0.7Ba0.1Ca0.1Sr0.1MnO3: A comparison between wet-mixing and sol-gel synthesis methods (2020)
  • Author(s): D. R. Munazat, B. Kurniawan, D. S. Razaq, K. Watanabe, and H. Tanaka
  • Journal Title: Physics B Volume: 592 Pages: 412227-412227
  • DOI: 10.1016/j.physb.2020.412227
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Role of Potassium Substitution in the Magnetic Properties and Magnetocaloric Effect in La0.8－xKxBa0.05Sr0.15MnO3 (0 < x <0.20) (2020)
  • Author(s): D. S. Razaq, B. Kurniawan, D. R. Munazat, K. Watanabe, and H. Tanaka
  • Journal Title: Crystals Volume: 10 Issue: 5 Pages: 407-407
  • DOI: 10.3390/cryst10050407
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Electrical Switching of the Nonreciprocal Directional Microwave Response in a Triplon Bose-Einstein Condensate (2020)
  • Author(s): Kimura Shojiro、Matsumoto Masashige、Tanaka Hidekazu
  • Journal Title: Physical Review Letters (Editors' Suggestion) Volume: 124 Issue: 21 Pages: 217401-217401
  • DOI: 10.1103/physrevlett.124.217401
  • Peer Reviewed
• [Journal Article] Spin Fluctuating Ground State in the Spin-1/2 Kagome Lattice (Rb1-xCsx)2Cu3SnF12 with x=0.53 Observed by Muon Spin Relaxation (2020)
  • Author(s): T. Suzuki, K. Katayama, I. Watanabe, and H. Tanaka
  • Journal Title: J. Phys. Soc. Jpn. Volume: 89 Issue: 7 Pages: 074701-074701
  • DOI: 10.7566/jpsj.89.074701
  • Peer Reviewed
• [Journal Article] Spin-driven ferroelectricity in the quantum magnet TlCuCl3 under high pressure (2020)
  • Author(s): Sakurai Kyosuke、Kimura Shojiro、Awaji Staoshi、Matsumoto Masashige、Tanaka Hidekazu
  • Journal Title: Physical Review B Volume: 102 Issue: 6 Pages: 064104-064104
  • DOI: 10.1103/physrevb.102.064104
  • Peer Reviewed
• [Journal Article] Sample dependence of half-integer quantized thermal Hall effect in the Kitaev spin-liquid candidate α?RuCl3 (2020)
  • Author(s): Yamashita M.、Gouchi J.、Uwatoko Y.、Kurita N.、Tanaka H.
  • Journal Title: Physical Review B Volume: 102 Issue: 22
  • DOI: 10.1103/physrevb.102.220404
  • Peer Reviewed
• [Journal Article] Particle-Hole Symmetry Breaking in a Spin Dimer System TlCuCl3 Observed at 100 T (2020)
  • Author(s): X. G. Zhou, Yuan Yao, Y. H. Matsuda, A. Ikeda, A. Matsuo, K. Kindo and H. Tanaka
  • Journal Title: Phys. Rev. Lett. Volume: 125 Issue: 26 Pages: 1-6
  • DOI: 10.1103/physrevlett.125.267207
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] ほぼ完全にフラストレートしたスピンダイマー量子磁性体の局在励起 (2020)
  • Author(s): 栗田伸之，田中秀数
  • Journal Title: 波紋 Volume: 30 Pages: 130-135
  • NAID: 130008123872
  • Peer Reviewed
• [Journal Article] Pressure-tuning the quantum spin Hamiltonian of the triangular lattice antiferromagnet Cs2CuCl4 (2019)
  • Author(s): Zvyagin S. A.、Graf D.、Sakurai T.、Kimura S.、Nojiri H.、Wosnitza J.、Ohta H.、Ono T.、Tanaka H.
  • Journal Title: Nature Communications Volume: 10 Issue: 1
  • DOI: 10.1038/s41467-019-09071-7
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Magnetic structure and high-field magnetization of the distorted kagome lattice antiferromagnet Cs2Cu3SnF12 (2019)
  • Author(s): Matan K.、Ono T.、Gitgeatpong G.、de Roos K.、Miao P.、Torii S.、Kamiyama T.、Miyata A.、Matsuo A.、Kindo K.、Takeyama S.、Nambu Y.、Piyawongwatthana P.、Sato T. J.、Tanaka H.
  • Journal Title: Physical Review B Volume: 99 Issue: 22
  • DOI: 10.1103/physrevb.99.224404
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Localized Magnetic Excitations in the Fully Frustrated Dimerized Magnet Ba2CoSi2O6Cl2 (2019)
  • Author(s): Nobuyuki Kurita, Daisuke Yamamoto, Takuya Kanesaka, Nobuo Furukawa, Seiko Ohira-Kawamura, Kenji Nakajima, and Hidekazu Tanaka
  • Journal Title: Physical Review Letters Volume: 123 Issue: 2 Pages: 027206-027206
  • DOI: 10.1103/physrevlett.123.027206
  • Peer Reviewed
• [Journal Article] Successive phase transitions and magnetization plateau in the spin-1 triangular-lattice antiferromagnet Ba2La2NiTe2O12 with small easy-axis anisotropy (2019)
  • Author(s): Saito Mutsuki、Watanabe Masari、Kurita Nobuyuki、Matsuo Akira、Kindo Koichi、Avdeev Maxim、Jeschke Harald O.、Tanaka Hidekazu
  • Journal Title: Physical Review B Volume: 100 Issue: 6
  • DOI: 10.1103/physrevb.100.064417
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Novel excitations near quantum criticality in geometrically frustrated antiferromagnet CsFeCl3 (2019)
  • Author(s): Hayashida Shohei、Matsumoto Masashige、Hagihala Masato、Kurita Nobuyuki、Tanaka Hidekazu、Itoh Shinichi、Hong Tao、Soda Minoru、Uwatoko Yoshiya、Masuda Takatsugu
  • Journal Title: Science Advances Volume: 5 Issue: 10
  • DOI: 10.1126/sciadv.aaw5639
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Microscopic evidence of a quantum magnetization process in the S=12 triangular-lattice Heisenberg-like antiferromagnet Ba3CoSb2O9 (2019)
  • Author(s): X. Z. Liu, O. Prokhnenko, M. Bartkowiak, Daisuke Yamamoto, N. Kurita, and H. Tanaka
  • Journal Title: Physical Review B Volume: 100 Issue: 9 Pages: 094436-094436
  • DOI: 10.1103/physrevb.100.094436
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Evidence of one-dimensional magnetic heat transport in the triangular-lattice antiferromagnet Cs2CuCl4 (2019)
  • Author(s): E. Schulze, S. Arsenijevic, L. Opherden, A. N. Ponomaryov, J. Wosnitza, T. Ono, H. Tanaka, and S. A. Zvyagin
  • Journal Title: Phys. Rev. Research Volume: 1 Issue: 3
  • DOI: 10.1103/physrevresearch.1.032022
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of High-Field and High-Pressure ESR System and Application to Triangular Antiferromagnet $$\hbox {CsCuCl}_{3}$$ (2019)
  • Author(s): Okuto Ryosuke、Ohki Eito、Sakurai Takahiro、Hijii Keigo、Takahashi Hideyuki、Ohmichi Eiji、Okubo Susumu、Ohta Hitoshi、Uwatoko Yoshiya、Tanaka Hidekazu
  • Journal Title: Applied Magnetic Resonance Volume: 50 Issue: 9 Pages: 1059-1065
  • DOI: 10.1007/s00723-019-01134-8
  • Peer Reviewed
• [Journal Article] スピン系の量子相転移と磁気励起 (2019)
  • Author(s): 田中秀数
  • Journal Title: 電子スピンサイエンス Volume: 17 Pages: 4-15
  • Peer Reviewed
• [Journal Article] Triplon band splitting and edge states in the quantum dimer compound Ba2CuSi2O6Cl2 (2018)
  • Author(s): K. Nawa, K. Tanaka, N. Kurita, T. J. Sato, H. Sugiyama, H. Uekusa, S. Ohira-Kawamura, K. Nakajima, S. Itoh, K. Kuwahara, and H. Tanaka
  • Journal Title: Nature Communications Volume: 印刷中 Issue: 1
  • DOI: 10.1038/s41467-019-10091-6
  • Peer Reviewed / Open Access
• [Journal Article] Local spin structure of the α?RuCl3 honeycomb-lattice magnet observed via muon spin rotation/relaxation (2018)
  • Author(s): Yamauchi Ichihiro、Hiraishi Masatoshi、Okabe Hirotaka、Takeshita Soshi、Koda Akihiro、Kojima Kenji M.、Kadono Ryosuke、Tanaka Hidekazu
  • Journal Title: Physical Review B Volume: 97 Issue: 13
  • DOI: 10.1103/physrevb.97.134410
  • Peer Reviewed
• [Journal Article] Unusual thermal Hall effect in a Kitaev spin liquid candidate α-RuCl3 (2018)
  • Author(s): Y. Kasahara, K. Sugii, T. Ohnishi, M. Shimozawa, M. Yamashita, N. Kurita, H. Tanaka, J. Nasu, Y. Motome, T. Shibauchi, and Y. Matsuda
  • Journal Title: Phys. Rev. Lett. Volume: 120 Issue: 21 Pages: 217205-217205
  • DOI: 10.1103/physrevlett.120.217205
  • Peer Reviewed
• [Journal Article] Pressure-induced quantum phase transition in quantum antiferromagnet CsFeCl3 (2018)
  • Author(s): S. Hayashida, O. Zaharko, N. Kurita, H. Tanaka, M. Hagihala, M. Soda, S. Itoh, Y. Uwatoko, and T. Masuda
  • Journal Title: Physical Review B Volume: 97 Issue: 14
  • DOI: 10.1103/physrevb.97.140405
  • Peer Reviewed
• [Journal Article] Electric dipole spin resonance in a quantum spin dimer system driven by magnetoelectric coupling (2018)
  • Author(s): Kimura Shojiro、Matsumoto Masashige、Akaki Mitsuru、Hagiwara Masayuki、Kindo Koichi、Tanaka Hidekazu
  • Journal Title: Physical Review B Volume: 97 Issue: 14 Pages: 140406-140406
  • DOI: 10.1103/physrevb.97.140406
  • Peer Reviewed
• [Journal Article] Majorana quantization and half-integer thermal quantum Hall effect in a Kitaev spin liquid (2018)
  • Author(s): Kasahara Y.、Ohnishi T.、Mizukami Y.、Tanaka O.、Ma Sixiao、Sugii K.、Kurita N.、Tanaka H.、Nasu J.、Motome Y.、Shibauchi T.、Matsuda Y.
  • Journal Title: Nature Volume: 559 Issue: 7713 Pages: 227-231
  • DOI: 10.1038/s41586-018-0274-0
  • NAID: 120006497340
  • Peer Reviewed
• [Journal Article] Spin fluctuations in the spin-1/2 kagome lattice antiferromagnet (Rb1-xCsx)2Cu3SnF12 around the quantum critical point detected by muon spin relaxation technique (2018)
  • Author(s): T. Suzuki, K. Katayama, I. Kawasaki, I. Watanabe and H. Tanaka
  • Journal Title: J. Phys. Soc. Jpn. Volume: 87 Issue: 7 Pages: 074708-074708
  • DOI: 10.7566/jpsj.87.074708
  • NAID: 210000134904
  • Peer Reviewed
• [Journal Article] Valence-Bond-Glass State with Singlet Gap in the Spin-1/2 Square-Lattice Random J1-J2 Heisenberg Antiferromagnet Sr2CuTe1-xWxO6 (2018)
  • Author(s): M. Watanabe, N. Kurita, H. Tanaka, W. Ueno, K. Matsui, and T. Goto
  • Journal Title: Physical Review B Volume: 98 Issue: 5
  • DOI: 10.1103/physrevb.98.054422
  • Peer Reviewed
• [Journal Article] Quantum magnetic properties of the spin-1/2 triangular-lattice antiferromagnet Ba2La2CoTe2O12 (2018)
  • Author(s): Y. Kojima, M. Watanabe, N. Kurita, H. Tanaka, A. Matsuo, K. Kindo, M. Avdeev
  • Journal Title: Physical Review B Volume: 98 Issue: 17
  • DOI: 10.1103/physrevb.98.174406
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Quasi-two-dimensional Bose-Einstein condensation of lattice bosons in the spin-12 XXZ ferromagnet K2CuF4 (2017)
  • Author(s): Hirata Satoshi、Kurita Nobuyuki、Yamada Motoki、Tanaka Hidekazu
  • Journal Title: Physical Review B Volume: 95 Issue: 17
  • DOI: 10.1103/physrevb.95.174406
  • Peer Reviewed
• [Journal Article] Magnetoelectric effect in the quantum spin gap system TlCuCl3 (2017)
  • Author(s): S. Kimura, K. Kakihata, Y. Sawada, K. Watanabe, M. Matsumoto, M. Hagiwara, and H. Tanaka
  • Journal Title: Physical Review B Volume: 95 Issue: 18 Pages: 184420-184420
  • DOI: 10.1103/physrevb.95.184420
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] High-field magnetization and magnetic phase diagram of α-Cu2V2O7 (2017)
  • Author(s): Gitgeatpong G.、Suewattana M.、Zhang Shiwei、Miyake A.、Tokunaga M.、Chanlert P.、Kurita N.、Tanaka H.、Sato T. J.、Zhao Y.、Matan K.
  • Journal Title: Physical Review B Volume: 95 Issue: 24
  • DOI: 10.1103/physrevb.95.245119
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic thermal conductivity far above the N?el temperature in the Kitaev-magnet candidate α?RuCl3 (2017)
  • Author(s): Hirobe Daichi、Sato Masahiro、Shiomi Yuki、Tanaka Hidekazu、Saitoh Eiji
  • Journal Title: Physical Review B Rapid Communication Volume: 95 Issue: 24 Pages: 241112-241112
  • DOI: 10.1103/physrevb.95.241112
  • Peer Reviewed
• [Journal Article] Structure of the magnetic excitations in the spin-1/2 triangular-lattice antiferromagnet Ba3CoSb2O9 (2017)
  • Author(s): S. Ito, N. Kurita, H. Tanaka, S. Ohira-Kawamura, K. Nakajima, S. Itoh, K. Kuwahara and K. Kakurai
  • Journal Title: Nat. Commun. Volume: 8
  • Peer Reviewed / Open Access
• [Journal Article] Collective and local excitations in Ba2CoTeO6: A composite system of a spin-1/2 triangular-lattice Heisenberg antiferromagnet and a honeycomb-lattice J1-J2 Ising antiferromagnet (2017)
  • Author(s): Chanlert Purintorn、Kurita Nobuyuki、Tanaka Hidekazu、Kimata Motoi、Nojiri Hiroyuki
  • Journal Title: Physical Review B Volume: 96 Issue: 6
  • DOI: 10.1103/physrevb.96.064419
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Universality of magnetic-field-induced Bose-Einstein condensation of magnons (2017)
  • Author(s): Shirasawa Kazuki、Kurita Nobuyuki、Tanaka Hidekazu
  • Journal Title: Physical Review B Volume: 96 Issue: 14
  • DOI: 10.1103/physrevb.96.144404
  • Peer Reviewed
• [Journal Article] Effects of magnetic field and hydrostatic pressure on the distorted triangular lattice antiferromagnet RbFeBr3 (2017)
  • Author(s): Kurita Nobuyuki、Tanaka Hidekazu
  • Journal Title: Journal of Physics: Conference Series Volume: 828 Pages: 012002-012002
  • DOI: 10.1088/1742-6596/828/1/012002
  • Peer Reviewed / Open Access
• [Journal Article] High field 1H-NMR study around a 1/4 plateau of quantum spin dimer system NH4CuCl3 (2017)
  • Author(s): K. Matsui, M. Fujisawa, H. Tanaka, R. Scheuermann and T. Goto
  • Journal Title: IOP Conf. Series: Journal of Physics: Conf. Series Volume: 828 Pages: 012011-012011
  • DOI: 10.1088/1742-6596/828/1/012011
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] EPR study of the triangular-lattice antiferromagnet Cs2CuBr4 (2017)
  • Author(s): E. Schulze, A. N. Ponomaryov, J. Wosnitza, H. Tanaka and S. A. Zvyagin
  • Journal Title: Low Temp. Phys. Volume: 43 Issue: 11 Pages: 1311-1314
  • DOI: 10.1063/1.5010318
  • Peer Reviewed / Int'l Joint Research
• [Presentation] スピン1/2フラストレート量子反強磁性体におけるボンドランダムネスの効果 (2022)
  • Author(s): 渡邊正理，栗田伸之，児島佑樹，齋藤睦己，伊藤孝，髭本亘，中村惇平，幸田章宏，田中秀数
  • Organizer: 日本物理学会 第77回年次大会
• [Presentation] S=1/2カゴメ格子反強磁性体Cs2Cu3SnF12におけるスピノン励起 (2022)
  • Author(s): 齋藤睦己，高岸龍之介，栗田伸之，渡邊正理，野村竜司，福元好志，池内和彦，梶本亮一，田中秀数
  • Organizer: 日本物理学会 第77回年次大会
• [Presentation] スピン1/2 Heisenberg 三角格子・Ising ハニカム格子複合反強磁性体Ba2CoTeO6のマグノンとスピノン (2022)
  • Author(s): 児島佑樹，栗田伸之，田中秀数，中島健次
  • Organizer: 日本物理学会 第77回年次大会
• [Presentation] 三角格子反強磁性体Ba3CoSb2O9の磁場中量子相転移 (2021)
  • Author(s): 田中秀数
  • Organizer: 第8回西日本強磁場科学研究会
  • Invited
• [Presentation] 強磁場と中性子散乱で探る三角格子量子反強磁性体の基底状態と素励起 (2021)
  • Author(s): 田中秀数
  • Organizer: 第8回強磁場コラボラトリーオンラインセミナー
  • Invited
• [Presentation] スピン1/2正方格子ハイゼンベルク反強磁性体SrLaCuMO6 (M=Sb, Nb)の磁性 (2021)
  • Author(s): 渡邊正理，栗田伸之，萩原雅人，松下雄一郎，田中秀数
  • Organizer: 日本物理学会 第76回年次大会
• [Presentation] 積層三角格子反強磁性体Sr3CoTa2O9の磁気特性評価 (2021)
  • Author(s): 西澤伊織，栗田伸之，田中秀数
  • Organizer: 日本物理学会 第76回年次大会
• [Presentation] S=1/2カゴメ格子反強磁性体Cs2Cu3SnF12の磁気励起 (2021)
  • Author(s): 齋藤睦己，高岸龍之介，渡邊正理，栗田伸之，野村竜司，池内和彦，中島健次，梶本亮一，福元好志，田中秀数
  • Organizer: 日本物理学会 第76回年次大会
• [Presentation] フラストレーションの強いスピン系の量子相転移と磁気励起の研究 (2020)
  • Author(s): 栗田伸之
  • Organizer: 電子スピンサイエンス学会
  • Invited
• [Presentation] μSR法によるスピン1/2ランダムボンド三角格子反強磁性体Ba2La2Co(Te1-xWx)2O12の磁気基底状態の研究 (2020)
  • Author(s): 渡邊正理，児島佑樹，栗田伸之，伊藤孝，髭本亘，中村惇平，幸田章宏，田中秀数
  • Organizer: 日本物理学会 2020年秋季大会
• [Presentation] スピン1/2Heisenberg三角格子・Isingハニカム格子の磁気励起とBa2CoTeO6の非弾性中性子散乱実験 (2020)
  • Author(s): 児島佑樹，栗田伸之，田中秀数，村井直樹，中島健次
  • Organizer: 日本物理学会 2020年秋季大会
• [Presentation] S=1/2カゴメ格子反強磁性体Rb2Cu3SnF12における高エネルギー磁気励起 (2020)
  • Author(s): 齋藤睦己，栗田伸之，池内和彦，梶本亮一，福元好志，田中秀数
  • Organizer: 日本物理学会 2020年秋季大会
• [Presentation] Magnetic Excitations in Triangular-Lattice Quantum Antiferromagnet Ba3CoSb2O9 (2019)
  • Author(s): H. Tanaka
  • Organizer: Tokyo Institute of Technology and Stony Brook University Joint Science and Technology Meeting
  • Int'l Joint Research / Invited
• [Presentation] Fractionalized Spin Excitations in Spin-1/2 Triangular- and Kagome-Lattice Antiferromagnets (2019)
  • Author(s): H. Tanaka
  • Organizer: J-PARC Symposium
  • Int'l Joint Research / Invited
• [Presentation] Structures of Magnetic Excitations in Spin-1/2 Triangular- and Kagome-Lattice Antiferromagnets (2019)
  • Author(s): H. Tanaka
  • Organizer: International Conference on Strongly Correlated Electron Systems
  • Int'l Joint Research / Invited
• [Presentation] Localized Magnetic Excitations of the Strongly Frustrated Dimerized Magnets (2019)
  • Author(s): N. Kurita and H. Tanaka
  • Organizer: International Conference on Strongly Correlated Electron Systems
  • Int'l Joint Research
• [Presentation] Randomness-Induced Quantum Disordered Ground State of S=1/2 Random J1-J2 Heisenberg Antiferromagnets (2019)
  • Author(s): M. Watanabe, N. Kurita, and H. Tanaka
  • Organizer: International Conference on Strongly Correlated Electron Systems
  • Int'l Joint Research
• [Presentation] Magnetic Excitations of Frustrated Quantum Spin Systems (2019)
  • Author(s): N. Kurita
  • Organizer: The 1st Workshop on Inelastic Neutron Scattering in Asia
  • Int'l Joint Research / Invited
• [Presentation] Magnetic Excitations in the Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet Ba3CoSb2O9 (2018)
  • Author(s): H. Tanaka
  • Organizer: ISSP Workshop, Present and Future of Neutron Scattering Research on Condensed Matter Physics
  • Int'l Joint Research / Invited
• [Presentation] Structure of Magnetic Excitations in a Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet Ba3CoSb2O9 (2018)
  • Author(s): H. Tanaka, S. Ito, N. Kurita, S. Ohira-Kawamura, K. Nakajima, S. Itoh, K. Kuwahara, and K. Kakurai
  • Organizer: International Conference on Highly Frustrated Magnetism -2018-
  • Int'l Joint Research
• [Presentation] Localized magnetic excitations of the strongly frustrated dimerized quantum magnet (2018)
  • Author(s): N. Kurita, S. Ohira-Kawamura, K. Nakajima, D. Yamamoto, T. Kanesawa, N. Furukawa, and H. Tanaka
  • Organizer: International Conference on Highly Frustrated Magnetism -2018-
  • Int'l Joint Research
• [Presentation] Low-temperature and high-magnetic-field ESR study of honeycomb-lattice quantum magnet α-RuCl3 (2018)
  • Author(s): N. Kurita, R. Takeda, H. Nojiri, and H. Tanaka
  • Organizer: International Conference on Magnetism 2018
  • Int'l Joint Research
• [Presentation] The Whole Picture of Magnetic Excitations in an S=1/2 Triangular-Lattice Heisenberg Antiferromagnet Ba3CoSb2O9 (2017)
  • Author(s): H. Tanaka, S. Ito, N. Kurita, S. Ohira-Kawamura, K. Nakajima, S. Itoh, K. Kuwahara, K. Kakurai
  • Organizer: Int. Conf. Neutron Scattering
  • Int'l Joint Research
• [Presentation] Localized Magnetic Excitations in the S=1/2 Fully Frustrated Dimerized Magnet Ba2CoSi2O6Cl2 (2017)
  • Author(s): N. Kurita, S. Ohira-Kawamura, K. Nakajima, D. Yamamoto, T. Kanetaka, N. Furukawa, H. Tanaka
  • Organizer: Int. Conf. Neutron Scattering
  • Int'l Joint Research
• [Presentation] Dispersionless excitations and crystallization of triplons in dimerized quantum magnet Ba2CoSi2O6Cl2 (2017)
  • Author(s): H. Tanaka
  • Organizer: International Workshop Flatband Networks in Condensed Matter and Photonics
  • Int'l Joint Research / Invited
• [Presentation] S=1擬2次元スピンダイマー系Ba2NiSi2O6Cl2の多周波ESR (2017)
  • Author(s): 田中秀数, 小池暢人, 栗田伸之, 渡邊正理, 赤木暢, 奥谷顕, 萩原政幸
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] フラストレーションの強いS=1スピンダイマー磁性体Ba2NiSi2O6Cl2における磁気励起 (2017)
  • Author(s): 栗田伸之, 那波和宏, 佐藤卓, 河村聖子, 中島健次, 田中秀数
  • Organizer: 日本物理学会2017年秋季大会
• [Remarks] 東京工業大学 理学院 物理学系 田中研究室
  • URL: http://www.lee.phys.titech.ac.jp/index.html