Development of apparatus for measuring field-angle-resolved entropy and its application to frustrated magnetic materials

• Project/Area Number: 18H01161
• 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: Chuo University (2020); The University of Tokyo (2018-2019)
• Principal Investigator: Kittaka Shunichiro 中央大学, 理工学部, 准教授 (80579805)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000); Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥15,340,000 (Direct Cost: ¥11,800,000、Indirect Cost: ¥3,540,000)
• Keywords: エントロピー / 比熱 / 磁気熱量効果 / 磁場回転 / フラストレート磁性体 / スピンアイス / 磁場角度依存性

Outline of Final Research Achievements

We have developed an innovative experimental method to measure the field-angle dependence of the entropy by taking advantage of the field-rotational magnetocaloric effect. By using this technique, we made the field-angle-resolved entropy landscape and succeeded in detecting the well-known spin-flip transition in the spin-ice compound Dy2Ti2O7 under a rotating magnetic field within the (1-10) plane. We also studied the quasi-kagome Kondo lattice CeRhSn and revealed that the high-entropy state survives up to a relatively high magnetic field when the field is applied precisely along the quasi-kagome plane. Thus, we have established a new experimental technique which is useful to investigate various phenomena in anisotropic systems.

Academic Significance and Societal Importance of the Research Achievements

エントロピーは系の縮重度を反映する基礎的な熱力学量である。本研究では、準断熱環境下で磁場回転に伴う試料の温度変化を精密に測定できる装置を開発し、従来の手法に比べて高速かつ精密にエントロピーの磁場角度変化を調べることを可能にした。これにより、異方性の大きな系で発現する新奇物性機構に迫る新たな実験手法を確立することができた。本装置を用いればエントロピーの温度－磁場－磁場角度マップを作成することができ、特定の磁場方位で観測される新奇現象の探究と解明に取り組むことが可能である。実際に、フラストレート磁性体や多極子伝導系の研究に応用し、物性機構の解明に貢献した。

Research Products

• [Int'l Joint Research] Southeast University/Zhejiang University of Technology(中国)
• [Int'l Joint Research] Max Planck Institute(ドイツ)
• [Int'l Joint Research] Max Planck Institute(ドイツ)
• [Int'l Joint Research] University of Oxford/Durham University/University of Warwick(英国)
• [Int'l Joint Research] Los Alamos National Laboratory/Florida State University/Eastern Washington University(米国)
• [Journal Article] Field-angle-resolved Landscape of Non-Fermi-liquid Behavior in the Quasi-kagome Kondo Lattice CeRhSn (2021)
  • Author(s): Shunichiro Kittaka, Yohei Kono, Suguru Tsuda, Toshiro Takabatake, and Toshiro Sakakibara
  • Journal Title: Journal of the Physical Society of Japan Volume: 90 Issue: 6 Pages: 064703-064703
  • DOI: 10.7566/jpsj.90.064703
  • Peer Reviewed
• [Journal Article] Orientation of point nodes and nonunitary triplet pairing tuned by the easy-axis magnetization in UTe2 (2020)
  • Author(s): Kittaka Shunichiro、Shimizu Yusei、Sakakibara Toshiro、Nakamura Ai、Li Dexin、Homma Yoshiya、Honda Fuminori、Aoki Dai、Machida Kazushige
  • Journal Title: Physical Review Research Volume: 2 Issue: 3 Pages: 032014-032014
  • DOI: 10.1103/physrevresearch.2.032014
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Evidence for nematic superconductivity of topological surface states in PbTaSe2 (2020)
  • Author(s): Le Tian、Sun Yue、Jin Hui-Ke、Che Liqiang、Yin Lichang、Li Jie、Pang Guiming、Xu Chunqiang、Zhao Lingxiao、Kittaka Shunichiro、Sakakibara Toshiro、Machida Kazushige、Sankar Raman、Yuan Huiqiu、Chen Genfu、Xu Xiaofeng、Li Shiyan、Zhou Yi、Lu Xin
  • Journal Title: Science Bulletin Volume: 65 Issue: 16 Pages: 1349-1355
  • DOI: 10.1016/j.scib.2020.04.039
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Fully gapped superconductivity without sign reversal in the topological superconductor PbTaSe2 (2020)
  • Author(s): Sun Yue、Kittaka Shunichiro、Sakakibara Toshiro、Machida Kazushige、Sankar R.、Xu Xiaofeng、Zhou Nan、Xing Xiangzhuo、Shi Zhixiang、Pyon Sunseng、Tamegai Tsuyoshi
  • Journal Title: Physical Review B Volume: 102 Issue: 2 Pages: 024517-024517
  • DOI: 10.1103/physrevb.102.024517
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Kitaev Spin Liquid Candidate OsxCl3 Comprised of Honeycomb Nano-Domains (2020)
  • Author(s): Kota Kataoka, Daigoro Hirai, Takeshi Yajima, Daisuke Nishio-Hamane, Rieko Ishii, Kwang-Yong Choi, Dirk Wulferding, Peter Lemmens, Shunichiro Kittaka, Toshiro Sakakibara, Hajime Ishikawa, Akira Matsuo, Koichi Kindo, and Zenji Hiroi
  • Journal Title: Journal of the Physical Society of Japan Volume: 89 Issue: 11 Pages: 1147091-9
  • DOI: 10.7566/jpsj.89.114709
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Field-Orientation Effect on Ferro-Quadrupole Order in PrTi2Al20 (2020)
  • Author(s): Kittaka Shunichiro、Taniguchi Takanori、Hattori Kazumasa、Nakamura Shota、Sakakibara Toshiro、Takigawa Masashi、Tsujimoto Masaki、Sakai Akito、Matsumoto Yosuke、Nakatsuji Satoru
  • Journal Title: Journal of the Physical Society of Japan Volume: 89 Issue: 4 Pages: 043701-043701
  • DOI: 10.7566/jpsj.89.043701
  • NAID: 40022211746
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Magnetic properties of a spin-1/2 honeycomb lattice antiferromagnet (2020)
  • Author(s): Y. Kono, T. Okabe, N. Uemoto, Y. Iwasaki, Y. Hosokoshi, S. Kittaka, T. Sakakibara, and H. Yamaguchi
  • Journal Title: Phys. Rev. B Volume: 101 Issue: 1 Pages: 014437-014437
  • DOI: 10.1103/physrevb.101.014437
  • Peer Reviewed
• [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] Emergent critical phenomenon in spin-1/2 ferromagnetic-leg ladders: Quasi-one-dimensional Bose-Einstein condensate (2019)
  • Author(s): Kono Y.、Kittaka S.、Yamaguchi H.、Hosokoshi Y.、Sakakibara T.
  • Journal Title: Physical Review B Volume: 100 Issue: 5 Pages: 05442-05442
  • DOI: 10.1103/physrevb.100.054442
  • Peer Reviewed
• [Journal Article] Fluctuation-Induced First-Order Transition and Tricritical Point in EuPtSi (2019)
  • Author(s): Sakakibara Toshiro、Nakamura Shota、Kittaka Shunichiro、Kakihana Masashi、Hedo Masato、Nakama Takao、Onuki Yoshichika
  • Journal Title: Journal of the Physical Society of Japan Volume: 88 Issue: 9 Pages: 093701-093701
  • DOI: 10.7566/jpsj.88.093701
  • NAID: 40022008704
  • Peer Reviewed
• [Journal Article] Quasiparticle Evidence for the Nematic State above Tc in SrxBi2Se3 (2019)
  • Author(s): Yue Sun, Shunichiro Kittaka, Toshiro Sakakibara, Kazushige Machida, Jinghui Wang, Jinsheng Wen, Xiangzhuo Xing, Zhixiang Shi, and Tsuyoshi Tamegai
  • Journal Title: Phys. Rev. Lett. Volume: 123 Issue: 2 Pages: 027002-027002
  • DOI: 10.1103/physrevlett.123.027002
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] S=1/2 ferromagnetic Heisenberg chain in a verdazyl-based complex (2019)
  • Author(s): Uemoto N.、Kono Y.、Kittaka S.、Sakakibara T.、Yajima T.、Iwasaki Y.、Miyamoto S.、Hosokoshi Y.、Yamaguchi H.
  • Journal Title: Physical Review B Volume: 99 Issue: 9 Pages: 094418-094418
  • DOI: 10.1103/physrevb.99.094418
  • Peer Reviewed
• [Journal Article] Anisotropic magnetic-field response of quantum critical fluctuations in Ni-doped CeCoIn5 (2019)
  • Author(s): M. Yokoyama, K. Suzuki, K. Tenya, S. Nakamura, Y. Kono, S. Kittaka, and T. Sakakibara
  • Journal Title: Physical Review B Volume: 99 Issue: 5
  • DOI: 10.1103/physrevb.99.054506
  • Peer Reviewed
• [Journal Article] Unconventional Field-Induced Spin Gap in an S=1/2 Chiral Staggered Chain (2019)
  • Author(s): Liu J.、Kittaka S.、Johnson R. D.、Lancaster T.、Singleton J.、Sakakibara T.、Kohama Y.、van Tol J.、Ardavan A.、Williams B. H.、Blundell S. J.、Manson Z. E.、Manson J. L.、Goddard P. A.
  • Journal Title: Physical Review Letters Volume: 122 Issue: 5 Pages: 0572071-0572076
  • DOI: 10.1103/physrevlett.122.057207
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Field-induced quantum magnetism in the verdazyl-based charge-transfer salt [o-MePy-V-(p-Br)2]FeCl4 (2018)
  • Author(s): Iwasaki Y.、Kida T.、Hagiwara M.、Kawakami T.、Kono Y.、Kittaka S.、Sakakibara T.、Hosokoshi Y.、Yamaguchi H.
  • Journal Title: Physical Review B Volume: 98 Issue: 22 Pages: 224411-224411
  • DOI: 10.1103/physrevb.98.224411
  • Peer Reviewed
• [Journal Article] Metamagnetic crossover in the quasikagome Ising Kondo-lattice compound CeIrSn (2018)
  • Author(s): S. Tsuda, C. L. Yang, Y. Shimura, K. Umeo, H. Fukuoka, Y. Yamane, T. Onimaru, T. Takabatake, N. Kikugawa, T. Terashima, H. T. Hirose, S. Uji, S. Kittaka, T. Sakakibara
  • Journal Title: Phys. Rev B. Volume: 98 Issue: 15 Pages: 155147-155147
  • DOI: 10.1103/physrevb.98.155147
  • Peer Reviewed
• [Journal Article] Low-Temperature Magnetization Measurements with Precise Two-Axis Alignment of the Sample Orientation (2018)
  • Author(s): Nakamura Shota、Kasahara Akira、Kittaka Shunichiro、Kono Yohei、Onuki Yoshichika、Sakakibara Toshiro
  • Journal Title: Journal of the Physical Society of Japan Volume: 87 Issue: 11 Pages: 114001-114001
  • DOI: 10.7566/jpsj.87.114001
  • NAID: 210000134999
  • Peer Reviewed
• [Journal Article] Field-enhanced quantum fluctuation in an S=1/2 frustrated square lattice (2018)
  • Author(s): Yamaguchi H.、Sasaki Y.、Okubo T.、Yoshida M.、Kida T.、Hagiwara M.、Kono Y.、Kittaka S.、Sakakibara T.、Takigawa M.、Iwasaki Y.、Hosokoshi Y.
  • Journal Title: Physical Review B Volume: 98 Issue: 9 Pages: 094402-094402
  • DOI: 10.1103/physrevb.98.094402
  • Peer Reviewed
• [Journal Article] Disorder-sensitive nodelike small gap in FeSe (2018)
  • Author(s): Sun Yue、Kittaka Shunichiro、Nakamura Shota、Sakakibara Toshiro、Zhang Peng、Shin Shik、Irie Koki、Nomoto Takuya、Machida Kazushige、Chen Jingting、Tamegai Tsuyoshi
  • Journal Title: Physical Review B Volume: 98 Issue: 6
  • DOI: 10.1103/physrevb.98.064505
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Searching for gap zeros in Sr2RuO4 via field-angle-dependent specific-heat measurement (2018)
  • Author(s): Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Naoki Kikugawa, Taichi Terashima, Shinya Uji, Dmitry A. Sokolov, Andrew P. Mackenzie, Koki Irie, Yasumasa Tsutsumi, Katsuhiro Suzuki, and Kazushige Machida
  • Journal Title: J. Phys. Soc. Jpn. Volume: 87 Issue: 9 Pages: 0937031-5
  • DOI: 10.7566/jpsj.87.093703
  • NAID: 210000134938
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Field-rotational Magnetocaloric Effect: A New Experimental Technique for Accurate Measurement of the Anisotropic Magnetic Entropy (2018)
  • Author(s): Kittaka Shunichiro、Nakamura Shota、Kadowaki Hiroaki、Takatsu Hiroshi、Sakakibara Toshiro
  • Journal Title: Journal of the Physical Society of Japan Volume: 87 Issue: 7 Pages: 073601-073601
  • DOI: 10.7566/jpsj.87.073601
  • NAID: 210000134879
  • Peer Reviewed / Open Access
• [Presentation] （一般シンポジウム講演）角度回転比熱測定からの超伝導ギャップ構造 (2020)
  • Author(s): 橘高 俊一郎
  • Organizer: 日本物理学会2020年秋季大会
• [Presentation] Superconducting gap structure of UTe2 studied from field-angle-resolved measurements of its specific heat (2020)
  • Author(s): S. Kittaka
  • Organizer: UTe2 online workshop
  • Int'l Joint Research
• [Presentation] Sr2RuO4における超伝導多重相の検証 (2020)
  • Author(s): 橘高 俊一郎
  • Organizer: J-Physics：多極子伝導系の物理 令和元年度領域全体会議
• [Presentation] 極低温精密比熱測定による超伝導ギャップ構造の決定 (2019)
  • Author(s): 橘高 俊一郎
  • Organizer: 第13回物性科学領域横断研究会 第14回「凝縮系科学賞」受賞講演
  • Invited
• [Presentation] Thermodynamic Evidence for Two Distinct Non-Fermi-Liquid Regimes and a Quantum Critical Line in the Quasi-Kagome Kondo-Lattice CeRhSn (2019)
  • Author(s): S. Kittaka, Y. Kono, S. Tsuda, T. Takabatake, and T. Sakakibara
  • Organizer: International Conference on Strongly Correlated Electron Systems 2019 (SCES2019)
  • Int'l Joint Research
• [Presentation] Thermodynamic study of the superconducting gap structure of Sr2RuO4 (2019)
  • Author(s): S. Kittaka
  • Organizer: J-Physics 2019 International Conference
  • Int'l Joint Research / Invited
• [Presentation] 比熱の磁場角度依存性から見たCd2Re2O7の超伝導ギャップ構造とネマティック状態 (2019)
  • Author(s): 橘高 俊一郎、平井 大悟郎、廣井 善二、町田 一成、榊原 俊郎
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] 磁場角度の効果から探るPrTi2Al20とPrIr2Zn20の多極子秩序相 (2019)
  • Author(s): 橘高 俊一郎
  • Organizer: J-Physics地域研究会・本郷
• [Presentation] Thermodynamic study of the pairing symmetry in Sr2RuO4 (2019)
  • Author(s): S. Kittaka
  • Organizer: Strontium Ruthenate - 25 years of a puzzling superconductor
  • Int'l Joint Research / Invited
• [Presentation] 擬カゴメ近藤格子CeRhSnにおける量子臨界性の磁場角度依存性 (2019)
  • Author(s): 橘高 俊一郎、河野 洋平、津田 研、高畠 敏郎、榊原 俊郎
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] Field-orientation effect on the hidden-order transition in URu2Si2 (2019)
  • Author(s): S. Kittaka
  • Organizer: Symposium:TPFC 2019
  • Int'l Joint Research
• [Presentation] Sr2RuO4の超伝導ギャップ構造の検証：回転磁場下での比熱測定から (2019)
  • Author(s): 橘高 俊一郎、中村 翔太、榊原 俊郎、菊川 直樹、寺嶋 太一、宇治 進也、Dmitry A. Sokolov、Andrew P. Mackenzie、入江 光輝、堤 康雅、鈴木 雄大、町田 一成
  • Organizer: つくば-柏-本郷 超伝導かけはしプロジェクト ワークショップ（2）
  • Invited
• [Presentation] Multiband full-gap superconductivity in heavy-fermion superconductor CeCu2Si2 revealed by specific-heat measurements (2019)
  • Author(s): S. Kittaka
  • Organizer: Plasma 2019 Workshop
  • Int'l Joint Research / Invited
• [Presentation] Thermodynamic study of Sr2RuO4: identification of the superconducting gap structure (2018)
  • Author(s): S. Kittaka, S. Nakamura, T. Sakakibara, N. Kikugawa, T. Terashima, S. Uji, D. A. Sokolov, A. P. Mackenzie, K. Irie, Y. Tsutsumi, K. Suzuki, and K. Machida
  • Organizer: International Workshop on j-Fermion Physics and Materials
  • Int'l Joint Research / Invited
• [Presentation] 磁場角度分解比熱・エントロピー測定からみたPrTi2Al20の四極子秩序 (2018)
  • Author(s): 橘高 俊一郎、谷口 貴紀、中村 翔太、榊原 俊郎、瀧川 仁、辻本 真規、酒井 明人、松本 洋介、中辻 知
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] Towards identification of the superconducting gap structure of Sr2RuO4: evidence for a horizontal line node gap from field-angle dependence of its specific heat (2018)
  • Author(s): S. Kittaka, S. Nakamura, T. Sakakibara, N. Kikugawa, T. Terashima, S. Uji, D. A. Sokolov, A. P. Mackenzie, K. Irie, Y. Tsutsumi, K. Suzuki, and K. Machida
  • Organizer: International Conference on Magnetism 2018 (ICM2018)
  • Int'l Joint Research
• [Remarks] 研究室のホームページ
  • URL: https://www.phys.chuo-u.ac.jp/labs/kittaka/index.html
• [Remarks] 個人のホームページ
  • URL: https://sakaki.issp.u-tokyo.ac.jp/user/kittaka/index.html
• [Remarks] 研究室のホームページ
  • URL: https://sakaki.issp.u-tokyo.ac.jp/