Study of spin chirality in quantum spin liquids by thermal-Hall measurement

• Project/Area Number: 19H01848
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: The University of Tokyo
• Principal Investigator: Yamashita Minoru 東京大学, 物性研究所, 准教授 (10464207)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000); Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2019: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
• Keywords: 量子スピン液体 / 熱ホール測定 / 熱輸送測定 / 熱ホール効果 / 熱輸送特性 / スピンカイラリティ

Outline of Research at the Start

物質中の電子がある種のねじれた構造をもつと、そのねじれかたに特有の性質が現れることが知られている。磁石のもととなる電子のスピンにも似たようなねじれ（スピンカイラリティ）による性質が現れることが理論的に予測されてきたが、スピンカイラリティをどのように実験的に検出してよいかわからなかった。そこで、本研究では熱流の微小な曲がり具合を測定する熱ホール測定を低温まで行うことによって、スピンカイラリティの研究を可能にする。これらの研究から量子スピン液体相におけるスピン励起のトポロジーやスピンカイラリティによる現象を明らかにする。

Outline of Final Research Achievements

In this study, in order to clarify the elementary excitations in the quantum spin liquid phase, we investigated the thermal Hall effect in magnetic insulators to clarify the effect of spin chirality of elementary spin excitations, which has been difficult to measure directly so far.
During the research period, we succeeded in performing thermal Hall measurements in the kagome antiferromagnet Cd-Capellasite, the skyrmion-host ferromagnetic insulator GaV4Se8, the new Kitaev-spin-liquid candidate Na2Co2TeO6, and the antiferro-skyrmion material MnSc2S4. Our successful measurements on these materials provide new knowledge on the relationship between the thermal Hall effect and the spin chirality in magnetic insulators.

Academic Significance and Societal Importance of the Research Achievements

磁場によって金属中を流れる電流が曲げられるホール効果と同様の現象が、金属の流れない絶縁体中の熱流に対する熱ホール効果として現れることを系統的に研究し、そのメカニズムの一端を明らかにした。特に、磁気スキルミオンのような磁気構造がうみだす創発磁場が電流だけでなく、熱流にも作用することを明らかにした。これらの成果は固体中のスピン構造が生み出す創発磁場の理解と応用を大きく進展させる結果であると考えている。

Research Products

• [Int'l Joint Research] Sungkyunkwan University/Korea University(韓国)
• [Journal Article] Resistivity and thermal conductivity of an organic insulator β'-EtMe3Sb[Pd(dmit)2]2 (2022)
  • Author(s): Yamashita Minoru、Sato Yuki、Kasahara Yuichi、Kasahara Shigeru、Shibauchi Takasada、Matsuda Yuji
  • Journal Title: Scientific Reports Volume: 12 Issue: 1 Pages: 9187-9187
  • DOI: 10.1038/s41598-022-13155-8
  • Peer Reviewed / Open Access
• [Journal Article] Charge and spin interplay in a molecular-dimer-based organic Mott insulator (2022)
  • Author(s): Natalia Drichko, Shiori Sugiura, Minoru Yamashita, Akira Ueda, Shinya Uji, Nora Hassan, Yoshiya Sunairi, Hatsumi Mori, Elena I. Zhilyaeva, Svetlana Torunova, and Rimma N. Lyubovskaya
  • Journal Title: Phys. Rev. B Volume: 106 Issue: 6 Pages: 064202-064202
  • DOI: 10.1103/physrevb.106.064202
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Topological thermal Hall effect of magnons in magnetic skyrmion lattice (2022)
  • Author(s): Akazawa Masatoshi、Lee Hyun-Yong、Takeda Hikaru、Fujima Yuri、Tokunaga Yusuke、Arima Taka-hisa、Han Jung Hoon、Yamashita Minoru
  • Journal Title: Physical Review Research Volume: 4 Issue: 4 Pages: 043085-043085
  • DOI: 10.1103/physrevresearch.4.043085
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Planar Thermal Hall Effects in Kitaev Spin Liquid Candidate Na2Co2TeO6 (2022)
  • Author(s): Hikaru Takeda, Jiancong Mai, Masatoshi Akazawa, Kyo Tamura, Jian Yan, Kalimuthu Moovendaran, Kalaivanan Raju, Raman Sankar, Kwang-Yong Choi, Minoru Yamashita
  • Journal Title: Phys. Rev. Research Volume: 4 Issue: 4
  • DOI: 10.1103/physrevresearch.4.l042035
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Anomalous electromagnetic response in spin-triplet superconductor UTe2 (2022)
  • Author(s): Shimizu Yusei、Kittaka Shunichiro、Kono Yohei、Sakakibara Toshiro、Machida Kazushige、Nakamura Ai、Li Dexin、Homma Yoshiya、Sato Yoshiki J.、Miyake Atsushi、Yamashita Minoru、Aoki Dai
  • Journal Title: Physical Review B Volume: 106 Issue: 21 Pages: 2145251-6
  • DOI: 10.1103/physrevb.106.214525
  • Peer Reviewed / Open Access
• [Journal Article] Field-induced topological Hall effect in antiferromagnetic axion insulator candidate EuIn2As2 (2022)
  • Author(s): Yan J.、Jiang Z. Z.、Xiao R. C.、Lu W. J.、Song W. H.、Zhu X. B.、Luo X.、Sun Y. P.、Yamashita M.
  • Journal Title: Physical Review Research Volume: 4 Issue: 1 Pages: 013163-013163
  • DOI: 10.1103/physrevresearch.4.013163
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Ferromagnetism out of charge fluctuation of strongly correlated electrons in κ-(BEDT-TTF)2Hg(SCN)2Br (2021)
  • Author(s): Yamashita Minoru、Sugiura Shiori、Ueda Akira、Dekura Shun、Terashima Taichi、Uji Shinya、Sunairi Yoshiya、Mori Hatsumi、Zhilyaeva Elena I.、Torunova Svetlana A.、Lyubovskaya Rimma N.、Drichko Natalia、Hotta Chisa
  • Journal Title: npj Quantum Materials Volume: 6 Issue: 1 Pages: 87-87
  • DOI: 10.1038/s41535-021-00387-6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Tuning the Parity Mixing of Singlet-Septet Pairing in a Half-Heusler Superconductor (2021)
  • Author(s): Ishihara K.、Takenaka T.、Miao Y.、Mizukami Y.、Hashimoto K.、Yamashita M.、Konczykowski M.、Masuki R.、Hirayama M.、Nomoto T.、Arita R.、Pavlosiuk O.、Wisniewski P.、Kaczorowski D.、Shibauchi T.
  • Journal Title: Physical Review X Volume: 11 Issue: 4 Pages: 041048-041048
  • DOI: 10.1103/physrevx.11.041048
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Strongly correlated superconductivity in a copper-based metal-organic framework with a perfect kagome lattice (2021)
  • Author(s): Takenaka T.、Ishihara K.、Roppongi M.、Miao Y.、Mizukami Y.、Makita T.、Tsurumi J.、Watanabe S.、Takeya J.、Yamashita M.、Torizuka K.、Uwatoko Y.、Sasaki T.、Huang X.、Xu W.、Zhu D.、Su N.、Cheng J.-G.、Shibauchi T.、Hashimoto K.
  • Journal Title: Science Advances Volume: 7 Issue: 12
  • DOI: 10.1126/sciadv.abf3996
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Ultralow temperature NMR of CeCoIn5 (2020)
  • Author(s): Yamashita M.、Tashiro M.、Saiki K.、Yamada S.、Akazawa M.、Shimozawa M.、Taniguchi T.、Takeda H.、Takigawa M.、Shishido H.
  • Journal Title: Physical Review B Volume: 102 Issue: 16 Pages: 165154-165154
  • DOI: 10.1103/physrevb.102.165154
  • 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] Thermal Hall Effects of Spins and Phonons in Kagome Antiferromagnet Cd-Kapellasite (2020)
  • Author(s): Akazawa Masatoshi、Shimozawa Masaaki、Kittaka Shunichiro、Sakakibara Toshiro、Okuma Ryutaro、Hiroi Zenji、Lee Hyun-Yong、Kawashima Naoki、Han Jung Hoon、Yamashita Minoru
  • Journal Title: Physical Review X Volume: 10 Issue: 4 Pages: 041059-041059
  • DOI: 10.1103/physrevx.10.041059
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Thermal-transport studies of kagome antiferromagnets (2020)
  • Author(s): M. Yamashita, M. Akazawa, M. Shimozawa, T. Shibauchi, Y. Matsuda, H. Ishikawa, T. Yajima, Z. Hiroi, M. Oda, H. Yoshida, H.-Y. Lee, J. H. Han and N. Kawashima
  • Journal Title: Journal of Physics: Condensed Matter Volume: 32 Issue: 7 Pages: 074001-074001
  • DOI: 10.1088/1361-648x/ab50e9
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Presence and absence of itinerant gapless excitations in the quantum spin liquid candidate EtMe3Sb[Pd(dmit)2]2 (2020)
  • Author(s): Yamashita M.、Sato Y.、Tominaga T.、Kasahara Y.、Kasahara S.、Cui H.、Kato R.、Shibauchi T.、Matsuda Y.
  • Journal Title: Physical Review B Volume: 101 Issue: 14 Pages: 140407-140407
  • DOI: 10.1103/physrevb.101.140407
  • Peer Reviewed / Open Access
• [Journal Article] Heavy Fermion State of YbNi2Si3 without Local Inversion Symmetry (2020)
  • Author(s): Nakamura Shota、Hyodo Kazushi、Matsumoto Yuji、Haga Yoshinori、Sato Hitoshi、Ueda Shigenori、Mimura Kojiro、Saiki Katsuyoshi、Iso Kosei、Yamashita Minoru、Kittaka Shunichiro、Sakakibara Toshiro、Ohara Shigeo
  • Journal Title: Journal of the Physical Society of Japan Volume: 89 Issue: 2 Pages: 024705-024705
  • DOI: 10.7566/jpsj.89.024705
  • NAID: 40022155106
  • Peer Reviewed
• [Journal Article] Boundary-limited and Glassy-like Phonon Thermal Conduction in EtMe3Sb[Pd(dmit)2]2 (2019)
  • Author(s): Yamashita Minoru
  • Journal Title: Journal of the Physical Society of Japan Volume: 88 Issue: 8 Pages: 083702-083702
  • DOI: 10.7566/jpsj.88.083702
  • Peer Reviewed
• [Presentation] Topological Thermal Hall Effect of Magnons in Magnetic Skyrmion Lattice (2023)
  • Author(s): Minoru Yamashita
  • Organizer: APS March meeting 2023
  • Int'l Joint Research
• [Presentation] Field-induced topological Hall effect in antiferromagnetic axion insulator candidate EuIn2As2 (2023)
  • Author(s): Jian Yan
  • Organizer: APS March meeting 2023
  • Int'l Joint Research
• [Presentation] Planar Thermal Hall Effects in Kitaev Spin Liquid Candidate Na2Co2TeO6 (2023)
  • Author(s): Hikaru Takeda
  • Organizer: APS March meeting 2023
  • Int'l Joint Research
• [Presentation] Evidence for phonon and magnon Hall effect in Kitaev candidate Na2Co2TeO6 (2023)
  • Author(s): Jian Yan
  • Organizer: 日本物理学会2023年春季大会
• [Presentation] トポロジカル反強磁性体EuIn2As2のNMR測定 (2023)
  • Author(s): 武田晃
  • Organizer: 日本物理学会2023年春季大会
• [Presentation] カゴメ格子超伝導体CsV3Sb5の自発的熱ホール測定に向けた取り組み (2023)
  • Author(s): 吉田大希
  • Organizer: 日本物理学会2023年春季大会
• [Presentation] Topological Thermal Hall Effects of Magnons in Ferro- and Antiferromagnetic Skyrmions (2022)
  • Author(s): Minoru Yamashita
  • Organizer: Highly Frustrated Magnetism 2022
  • Int'l Joint Research
• [Presentation] Thermal Hall Effects of Spins and Phonons in Kagome Antiferromagnets (2022)
  • Author(s): Minoru Yamashita
  • Organizer: Gordon Research Conference, Topology and Correlations
  • Int'l Joint Research / Invited
• [Presentation] キタエフスピン液体候補物質Na2Co2TeO6の熱輸送測定 (2022)
  • Author(s): 麦健聡，武田晃，赤澤仁寿，田村響，Jian Yan，山下穣, R. Kalaivanan, R. Sankar, K. Y. Choi
  • Organizer: 日本物理学会 第77回年次大会
• [Presentation] 磁気スキルミオンホスト物質GaV4Se8の熱ホール効果における磁場中冷却の影響 (2021)
  • Author(s): 赤澤仁寿, 武田晃, 山下穣, 藤間友理, 徳永祐介, 有馬孝尚, Hyun-Yong Lee, Jung Hoon Han
  • Organizer: 日本物理学会 ２０２１年秋季大会
• [Presentation] ダイアモンド格子反強磁性体MnSc2S4の熱輸送測定 (2021)
  • Author(s): 田村響, 武田晃, 赤澤仁寿, Jian Yan, 山下穣, 鳴海康雄, 佐藤和樹, 萩原政幸, 和氣剛, 中村裕之
  • Organizer: 日本物理学会 ２０２１年秋季大会
• [Presentation] 磁気スキルミオンホスト物質 GaV4Se8の熱輸送特性 (2020)
  • Author(s): 赤澤仁寿，武田晃，山下穣，藤間友理 ，有馬孝尚
  • Organizer: 日本物理学会 2020年秋季大会
• [Presentation] キラル反強磁性体CsCuCl3のc軸熱輸送特性II (2019)
  • Author(s): 赤澤仁寿, 下澤雅明, 山下 穣, 高阪勇輔, 秋光 純, 土屋直人, 井上克也, J. Zaccaro, I. Gautier-Luneau, D. Luneau
  • Organizer: 日本物理学会 2019年秋季大会
• [Presentation] CeCoIn5における超低温下NMR測定 IV (2019)
  • Author(s): 斉木克祥、山下穣、下澤雅明、武田晃、瀧川仁、宍戸寛明
  • Organizer: 日本物理学会 2019年秋季大会
• [Presentation] Anomalous Thermal Hall Effect in Chiral Antiferromagnet Mn3Sn (2019)
  • Author(s): Minoru Yamashita
  • Organizer: 2019 KPS Fall Meeting
  • Int'l Joint Research / Invited
• [Remarks] 有機モット絶縁体中で電荷揺らぎによる強磁性相互作用の発見
  • URL: https://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=14020
• [Remarks] 従来のスピン一重項・三重項の枠組みを超えた超伝導クーパー対状態の発見、その制御も可能に
  • URL: https://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=14164
• [Remarks] カゴメ反強磁性体でスピンとフォノンの両方による熱ホール効果の観測に成功
  • URL: http://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=11773