Pairing mechanism of multiband full-gap superconductivity in heavy-electron systems

• Project/Area Number: 15K05158
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: Kittaka Shunichiro 東京大学, 物性研究所, 助教 (80579805)
• Co-Investigator(Renkei-kenkyūsha): SAKAKIBARA Toshiro 東京大学, 物性研究所, 教授 (70162287)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 重い電子系超伝導 / 超伝導ギャップ / 比熱 / 磁場回転 / 圧力下比熱 / 磁場角度依存性 / 重い電子系 / 超伝導 / 静水圧力 / 角度分解磁場中比熱 / ギャップ対称性

Outline of Final Research Achievements

Pairing mechanism of heavy-fermion superconductivity has attracted much attention because the first discovered heavy-fermion superconductor CeCu2Si2 has been unexpectedly revealed to be a multiband full-gap superconductor. In this study, we have examined the gap symmetry of CeCu2Si2 and those of various exotic superconductors, in order to deepen understanding of their exotic pairing mechanisms. Furthermore, we developed an apparatus for measuring field-angle-dependent specific heat under pressure to study the pressure effect on the gap structure.

Research Products

• [Int'l Joint Research] Max Planck Institute(Germany)
• [Int'l Joint Research] Max Planck Institute(Germany)
• [Int'l Joint Research] University of Salzburg(Austria)
• [Journal Article] Superconducting symmetries and magnetic responses of uranium heavy-fermion systems UBe13 and UPd2Al3 (2018)
  • Author(s): Y. Shimizu, S. Kittaka, T. Sakakibara, and D. Aoki.
  • Journal Title: Physica B (accepted) Volume: 印刷中 Pages: 553-557
  • DOI: 10.1016/j.physb.2017.09.036
  • Peer Reviewed
• [Journal Article] Quasi-one-dimensional Bose-Einstein condensation in the spin-1/2 ferromagnetic-leg ladder 3-I-V (2018)
  • Author(s): Kono Y.,Kittaka S.,Yamaguchi H.,Hosokoshi Y.,Sakakibara T.
  • Journal Title: Physical Review B Volume: 97 Issue: 10
  • DOI: 10.1103/physrevb.97.100406
  • Peer Reviewed
• [Journal Article] Gap structure of FeSe determined by angle-resolved specific heat measurements in applied rotating magnetic field (2017)
  • Author(s): Y. Sun, S. Kittaka, S. Nakamura, T. Sakakibara, K. Irie, T. Nomoto, K. Machida, J. Chen, and T. Tamegai
  • Journal Title: Phys. Rev. B Volume: 96 Issue: 22
  • DOI: 10.1103/physrevb.96.220505
  • Peer Reviewed
• [Journal Article] Quasiparticle excitations and evidence for superconducting double transitions in mono crystalline U0.97Th0.03Be13 (2017)
  • Author(s): Y. Shimizu, S. Kittaka, S. Nakamura, T. Sakakibara, D. Aoki, Y. Homma, A. Nakamura, and K. Machida
  • Journal Title: Phys. Rev. B Volume: 96 Issue: 10 Pages: 100505-100505
  • DOI: 10.1103/physrevb.96.100505
  • Peer Reviewed
• [Journal Article] Wing structure in the phase diagram of the Ising ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements (Editors' suggestion) (2017)
  • Author(s): S. Nakamura, T. Sakakibara, Y. Shimzu, S. Kittaka, Y. Kono, Y. Haga, J. Pospisil, and E. Yamamoto.
  • Journal Title: Physical review B Volume: 96 Issue: 9 Pages: 0944111-9
  • DOI: 10.1103/physrevb.96.094411
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu2Si2 (2017)
  • Author(s): T. Yamashita, T. Takenaka, Y. Tokiwa, J. A. Wilcox, Y. Mizukami, D. Terazawa, Y. Kasahara, S. Kittaka, T. Sakakibara, M. Konczykowski, S. Seiro, H. S. Jeevan, C. Geibel, C. Putzke, T. Onishi, H. Ikeda, A. Carrington, T. Shibauchi, Y. Matsuda
  • Journal Title: Science Advances Volume: 3 Issue: 6 Pages: 1601667-1601667
  • DOI: 10.1126/sciadv.1601667
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Nodal gap structure of the heavy-fermion superconductor URu2Si2revealed by field-angle-dependent specific-heat measurements (2017)
  • Author(s): Kittaka Shunichiro、Shimizu Yusei、Sakakibara Toshiro、Haga Yoshinori、Yamamoto Etsuji、Onuki Yoshichika、Tsutsumi Yasumasa、Nomoto Takuya、Ikeda Hiroaki、Machida Kazushige
  • Journal Title: Journal of Physics: Conference Series Volume: 807 Pages: 052001-052001
  • DOI: 10.1088/1742-6596/807/5/052001
  • Peer Reviewed
• [Journal Article] 磁場角度回転比熱測定による超伝導研究 (2017)
  • Author(s): 橘高俊一郎
  • Journal Title: 物性研究・電子版 Volume: 6
  • Open Access
• [Journal Article] Omnidirectional Measurements of Angle-Resolved Heat Capacity for Complete Detection of Superconducting Gap Structure in the Heavy-Fermion Antiferromagnet UPd2Al3 (2016)
  • Author(s): Y. Shimizu, S. Kittaka, T. Sakakibara, Y. Tsutsumi, T. Nomoto, H. Ikeda, K. Machida, Y. Homma, and D. Aoki
  • Journal Title: Phys. Rev. Lett. Volume: 117 Issue: 3 Pages: 0370011-5
  • DOI: 10.1103/physrevlett.117.037001
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Quadrupole-Driven Non-Fermi Liquid and Magnetic-Field Induced Heavy Fermion States in a Non-Kramers Doublet System (2016)
  • Author(s): T. Onimaru, K. Izawa, K. T. Matsumoto, T. Yoshida, Y. Machida, T. Ikeura, K. Wakiya, K. Umeo, S. Kittaka, K. Araki, T. Sakakibara, T. Takabatake
  • Journal Title: Phys. Rev. B Volume: 94 Issue: 7
  • DOI: 10.1103/physrevb.94.075134
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Angle-resolved heat capacity of heavy fermion superconductors (2016)
  • Author(s): T. Sakakibara, S. Kittaka, and K. Machida
  • Journal Title: Rep. Prog. Phys. Volume: 79 Issue: 9 Pages: 094002-094002
  • DOI: 10.1088/0034-4885/79/9/094002
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Thermodynamic study of gap structure and pair-breaking effect by magnetic field in the heavy-fermion superconductor CeCu2Si2 (2016)
  • Author(s): S. Kittaka, Y. Aoki, Y. Shimura, T. Sakakibara, S. Seiro, C. Geibel, F. Steglich, Y. Tsutsumi, H. Ikeda, and K. Machida
  • Journal Title: Phys. Rev. B Volume: 94 Issue: 5 Pages: 054514-054514
  • DOI: 10.1103/physrevb.94.054514
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] 重い電子系における超伝導研究の新展開 ―磁場角度分解比熱測定からみたギャップ対称性― (2016)
  • Author(s): 橘高俊一郎、榊原俊郎、町田一成
  • Journal Title: 固体物理 Volume: 51 Pages: 411-427
  • NAID: 40020935615
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Evidence for chiral d-wave superconductivity in URu2Si2 from the field-angle variation of its specific heat (2016)
  • Author(s): Shunichiro Kittaka, Yusei Shimizu, Toshiro Sakakibara, Yoshinori Haga, Etsuji Yamamoto, Yoshichika Onuki, Yasumasa Tsutsumi, Takuya Nomoto, Hiroaki Ikeda, and Kazushige Machida
  • Journal Title: J. Phys. Soc. Jpn. Volume: 85 Issue: 3 Pages: 033704-033704
  • DOI: 10.7566/jpsj.85.033704
  • NAID: 210000133846
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] First-order superconducting transition of Sr2RuO4 investigated by magnetization and magnetic torque (2016)
  • Author(s): Shunichiro Kittaka, Akira Kasahara, Toshiro Sakakibara, Daisuke Shibata, Shingo Yonezawa, Yoshiteru Maeno, Kenichi Tenya, and Kazushige Machida
  • Journal Title: J. Magn. Magn. Mater. Volume: 400 Pages: 81-83
  • DOI: 10.1016/j.jmmm.2015.07.004
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Heat capacity measurements on UBe13 in rotated magnetic fields: anisotropic response in the normal state and the absence of nodal quasiparticles (2016)
  • Author(s): Yusei Shimizu, Shunichiro Kittaka, Toshiro Sakakibara, Yoshinori Haga, Etsuji Yamamoto, Hiroshi Amitsuka, Yasumasa Tsutsumi, and Kazushige Machida
  • Journal Title: J. Magn. Magn. Mater. Volume: 400 Pages: 52-55
  • DOI: 10.1016/j.jmmm.2015.08.003
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Field-Orientation Dependence of Low-Energy Quasiparticle Excitations in the Heavy-Electron Superconductor UBe13 (2015)
  • Author(s): Y. Shimizu, S. Kittaka, T. Sakakibara, Y. Haga, E. Yamamoto, H. Amitsuka, Y. Tsutsumi, and K. Machida
  • Journal Title: Phys. Rev. Lett. Volume: 114 Issue: 14
  • DOI: 10.1103/physrevlett.114.147002
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 極低温におけるSr2RuO4の磁場角度分解比熱 (2017)
  • 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 Sokolov、Andrew P. Mackenzie、堤康雅、町田一成
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学（大阪府吹田市）
  • Year and Date: 2017-03-17
• [Presentation] （若手奨励賞） 磁場方位制御下の精密比熱測定による重い電子系超伝導の研究 (2017)
  • Author(s): 橘高俊一郎
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学（大阪府吹田市）
  • Year and Date: 2017-03-17
  • Invited
• [Presentation] （シンポジウム講演） 比熱測定から見た重い電子系超伝導体のギャップ構造 (2017)
  • Author(s): 橘高俊一郎
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学（大阪府吹田市）
  • Year and Date: 2017-03-17
  • Invited
• [Presentation] Gap structure and paring mechanism of non-centrosymmetric superconductor PbTaSe2 (2017)
  • Author(s): Y. Sun, S. Kittaka, T. Sakakibara, S. Pyon, and T. Tamegai
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] 重い電子系U1-xThxBe13の極低温電気抵抗・比熱における非フェルミ液体的性質 (2017)
  • Author(s): 清水 悠晴、橘高 俊一郎、中村 翔太、榊原 俊郎、青木 大、佐藤 芳樹、本間 佳哉、仲村 愛、Maurya Arvind、李 徳新、本多 史憲
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] URhGeのb方向近傍の極低温比熱・磁気熱量効果測定 (2017)
  • Author(s): 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、J. Pospisil、山本 悦嗣
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] Gap structure of uranium superconductors studied by specific heat (2017)
  • Author(s): S. Kittaka
  • Organizer: Physics of Uranium-based Unconventional superconductors
  • Int'l Joint Research / Invited
• [Presentation] 磁場角度分解比熱測定によるSr2RuO4の超伝導ギャップ構造の再検証 (2017)
  • 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 Sokolov、Andrew P. Mackenzie、入江 光輝、堤 康雅、町田 一成
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] 強磁性超伝導体UCoGeにおける極低温磁場回転比熱測定 (2017)
  • Author(s): 中村 翔太、橘高 俊一郎、清水 悠晴、河野 洋平、榊原 俊郎、青木 大、仲村 愛、本多 史憲、Jacques Flouquet
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] 重い電子系超伝導体U0.97Th0.03Be13における極低温精密磁化測定 (2017)
  • Author(s): 清水 悠晴、中村 翔太、河野 洋平、橘高 俊一郎、榊原 俊郎、青木 大、本間 佳哉、仲村 愛、町田 一成
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] Disorder-sensitive node-like small gap in FeSe (2017)
  • Author(s): Y. Sun, S. Kittaka, T. Sakakibara, J. Chen, T. Tamegai, K. Machida
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] Superconducting gap structure of Sr2RuO4 revisited by the field-angle-dependent specific heat at very low temperatures (2017)
  • Author(s): S. Kittaka, S. Nakamura, T. Sakakibara, N. Kikugawa, T. Terashima, S. Uji, D. Sokolov, A. P. Mackenzie, K. Irie, Y. Tsutsumi, and K. Machida
  • Organizer: International Conference on Strongly Correlated Electron Systems 2017 (SCES2017)
  • Int'l Joint Research
• [Presentation] Field-angle-resolved Specific Heat of Uranium Superconductors (2017)
  • Author(s): S. Kittaka, Y. Shimizu, and T. Sakakibara
  • Organizer: ACTINIDES2017
  • Int'l Joint Research / Invited
• [Presentation] 準粒子励起構造から探るSr2RuO4のノード構造と対称性 (2017)
  • Author(s): 橘高 俊一郎
  • Organizer: 基研研究会 「超伝導研究の最先端：多自由度、非平衡、電子相関、トポロジー、人工制御」
  • Invited
• [Presentation] Searching for Gap Nodes in the Heavy-fermion Superconductor CeCu2Si2 from Specific-heat Measurement (2016)
  • Author(s): S. Kittaka, Y. Aoki, Y. Shimura, T. Sakakibara, S. Seiro, C. Geibel, F. Steglich, Y. Tsutsumi, H. Ikeda, and K. Machida
  • Organizer: 29th International Symposium on Superconductivity (ISS2016)
  • Place of Presentation: 東京国際フォーラム（東京都千代田区）
  • Year and Date: 2016-12-13
  • Int'l Joint Research
• [Presentation] 超伝導体Zr2Coの磁場角度分解比熱 (2016)
  • Author(s): 橘高俊一郎、榊原俊郎、垣花将司、照屋淳志、辺土正人、仲間隆男、大貫惇睦
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 金沢大学（石川県金沢市）
  • Year and Date: 2016-09-13
• [Presentation] Nodal gap structure of the heavy-fermion superconductor URu2Si2 revealed by field-angle-dependent specific-heat measurements (2016)
  • Author(s): S. Kittaka, Y. Shimizu, T. Sakakibara, Y. Haga, E. Yamamoto, Y. Onuki, Y. Tsutsumi, T. Nomoto, H. Ikeda, and K. Machida
  • Organizer: International Conference on Strongly Correlated Electron Systems (SCES2016)
  • Place of Presentation: Hangzhou (China)
  • Year and Date: 2016-05-08
  • Int'l Joint Research
• [Presentation] 超伝導ギャップ構造の解析に適した圧力下角度分解磁場中比熱測定装置の開発 (2016)
  • Author(s): 橘高俊一郎、松林和幸、上床美也、榊原俊郎
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県仙台市）
  • Year and Date: 2016-03-19
• [Presentation] 重い電子系超伝導体UBe13における極低温高磁場中比熱 (2016)
  • Author(s): 清水悠晴、橘高俊一郎、河野洋平、榊原俊郎、芳賀芳範、山本悦嗣、網塚浩、町田一成
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県仙台市）
  • Year and Date: 2016-03-19
• [Presentation] Sr2RuO4の一軸性圧力下比熱 (2016)
  • Author(s): 山崎照夫、橘高俊一郎、伊藤温海、榊原俊郎、矢口宏
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県仙台市）
  • Year and Date: 2016-03-19
• [Presentation] UCoGeの容易軸方向磁場下における磁化と比熱の測定 (2016)
  • Author(s): 中村翔太、河野洋平、清水悠晴、橘高俊一郎、榊原俊郎、青木大、仲村愛、本多史憲、Jacques Flouquet
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県仙台市）
  • Year and Date: 2016-03-19
• [Presentation] 重い電子系における超伝導研究の新展開 ～磁場角度分解比熱測定からみたギャップ対称性～ (2016)
  • Author(s): 橘高俊一郎
  • Organizer: 日本学術会議公開シンポジウム 「物性物理学・一般物理学分野の展開と大型研究計画」
  • Place of Presentation: 日本学術会議（東京都港区）
  • Year and Date: 2016-03-11
• [Presentation] URu2Si2純良単結晶の極低温磁場中比熱 (2015)
  • Author(s): 橘高俊一郎、清水悠晴、榊原俊郎、芳賀芳範、山本悦嗣、大貫惇睦、堤康雅、町田一成
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（大阪府吹田市）
  • Year and Date: 2015-09-16
• [Presentation] 比熱測定から見た重い電子系反強磁性超伝導体UPd2Al3の超伝導準粒子励起構造 (2015)
  • Author(s): 清水悠晴、橘高俊一郎、榊原俊郎、本間佳哉、青木大
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（大阪府吹田市）
  • Year and Date: 2015-09-16
• [Presentation] Recent progress on the gap determination of heavy-fermion superconductors (2015)
  • Author(s): S. Kittaka
  • Organizer: Electron correlation in nanostructures
  • Place of Presentation: Odessa (Ukraine)
  • Year and Date: 2015-09-03
  • Int'l Joint Research / Invited
• [Presentation] First-order superconducting transition of Sr2RuO4 investigated by magnetization and magnetic torque (2015)
  • Author(s): S. Kittaka, A. Kasahara, T. Sakakibara, D. Shibata, S. Yonezawa, Y. Maeno, K. Tenya, and K. Machida
  • Organizer: The 20th International Conference on Magnetism (ICM2015)
  • Place of Presentation: Barcelona (Spain)
  • Year and Date: 2015-07-05
  • Int'l Joint Research
• [Presentation] Heat capacity measurements on UBe13 in rotated magnetic fields: anisotropic response in the normal state and the absence of nodal quasiparticles (2015)
  • Author(s): Y. Shimizu, S. Kittaka, T. Sakakibara, Y. Haga, E. Yamamoto, H. Amitsuka, Y. Tsutsumi, and K. Machida
  • Organizer: The 20th International Conference on Magnetism (ICM2015)
  • Place of Presentation: Barcelona (Spain)
  • Year and Date: 2015-07-05
  • Int'l Joint Research
• [Remarks] 研究室のホームページ
  • URL: http://sakaki.issp.u-tokyo.ac.jp/
• [Remarks] 個人のホームページ
  • URL: http://sakaki.issp.u-tokyo.ac.jp/user/kittaka/index.html