Discovery and clarification of exotic superconducting phases

2010 Fiscal Year Self-evaluation Report

• Project Area: Emergence of Heavy Electrons and Their Ordering
• Project/Area Number: 20102006
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyoto University
• Principal Investigator: ISHIDA Kenji Kyoto University, 大学院・理学研究科, 教授 (90243196)
• Project Period (FY): 2008 – 2012
• Keywords: 重い電子超伝導体 / 新奇超伝導相 / Ce系化合物 / U系化合物 / FFLO状態 / 強磁性超伝導体

Research Abstract

今世紀になり、セリウムやウランなど、f電子を含む重い電子系化合物の中にエキゾチック超伝導状態が次々と発見され、現在活発に研究されている。このエキゾチック超伝導状態の理解は、強相関電子系の新奇凝縮相の理解にとって大変重要である。本研究班は、電子輸送現象測定、熱測定、磁気測定、高周波測定、中性子散乱実験、核磁気共鳴、ミュオンスピン緩和およびトンネル顕微鏡の物性測定のスペシャリストから構成され、主にA01班で作成された純良単結晶の超伝導体や、分子線エピタキシ-(MBE)によって合成された人工超格子重い電子化合物を、多角的且つ詳細な物性測定により新奇超伝導相の物性を明らかにすることを目的にしている。また得られた実験結果を基に、実験理論の両面から新奇超伝導相の秩序状態を理解することに努める。

Research Products

• [Journal Article] Evolution of Paramagnetic Quasiparticle Excitations Emerged in the High-Field Superconducting Phase of CeCoIn5 (2011)
  • Author(s): K.Kumagai, H.Shishido, T.Shibauchi, Y.Matsuda
  • Journal Title: Phys.Rev.Lett. 106 Pages: 137004
  • Peer Reviewed
• [Journal Article] Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2 (2011)
  • Author(s): R.Okazaki, T.Shibauchi, H.J.Shi, Y.Haga, T.D.Matsuda, E.Yamamoto, Y.Onuki, H.Ikeda, Y.Matsuda
  • Journal Title: Science 331 Pages: 439-442
  • Peer Reviewed
• [Journal Article] Microscopic Coexistence of Ferromagnetism and Superconductivity in Single-Crystal UCoGe (2010)
  • Author(s): T.Ohta, T.Hattori, K.Ishida, Y.Nakai, E.Osaki, K.Deguchi, N.K.Sato, I.Satoh
  • Journal Title: J.Phys.Soc.of Jpn. 79 Pages: 023707-1-023707-4
  • Peer Reviewed
• [Journal Article] Absence of Meissner State and Robust Ferromagnetism in the Superconducting State of UCoGe : Possible Evidence of Spontaneous Vortex State (2010)
  • Author(s): K.Deguchi, E.Osaki, S.Ban, N.Tamura, N.Y.Shimura, T.Sakakibara, I.Satoh, N.K.Sato
  • Journal Title: J.Phys.Soc.of Jpn. 79 Pages: 023707-1-023707-4
  • Peer Reviewed
• [Journal Article] Crossover from the Quantum Critical to Overdamped Regime in the Heavy-Fermion System USn3 (2010)
  • Author(s): S.Kambe, H.Sakai, Y.Tokunaga, T.D.Matsuda, Y.Haga, H.Chudo, R.E.Walstedt
  • Journal Title: Phys.Rev.Lett. 102 Pages: 037208-1-037208-4
  • Peer Reviewed
• [Journal Article] Tuning the Dimensionality of the Heavy Fermion Compound CeIn3 (2010)
  • Author(s): H.Shishido, T.Shibauchi, K.Yasu, T.Kato, H.Kontani, T.Terashima, Y.Matsuda
  • Journal Title: Science 327 Pages: 980-983
  • Peer Reviewed
• [Presentation] Correlation of Ferromagnetism and Superconductivity in UCoGe (2010)
  • Author(s): 佐藤憲昭
  • Organizer: International Conference on Magnetic Materials 2010
  • Place of Presentation: Kolkata, India 招待講演
  • Year and Date: 20101025-20101029
• [Presentation] Probing quantum criticality in strongly correlated electron systems by transport coefficients (2010)
  • Author(s): 井澤公一
  • Organizer: International Workshop : The New Generation in Strongly Correlated Electron Systems 2010
  • Place of Presentation: Lanzarote Spain 招待講演
  • Year and Date: 20100620-20100625
• [Presentation] 59Co-NQR and NMR Studies on Ferromagnetic Superconductor UCoGe (2010)
  • Author(s): 石田憲二
  • Organizer: The 11th Asia Pacific Physics Conference (APPC11)
  • Place of Presentation: Shanghai 中国 招待講演
  • Year and Date: 2010-11-17
• [Presentation] Magnetic fluctuations and Unconventional superconductivity in Actinide compounds (2010)
  • Author(s): 神戸振作
  • Organizer: International conference "Pu Futures 2010
  • Place of Presentation: Colorado, USA 招待講演
  • Year and Date: 2010-09-21
• [Presentation] First observation of well-ordered vortex lattice in non-doped KFe2As2 superconductor by SANS technique (2010)
  • Author(s): 古川はづき
  • Organizer: International Conference on Superconductivity and Magnetism (ICSM2010)
  • Place of Presentation: Antalya Turkey 招待講演
  • Year and Date: 2010-04-27
• [Presentation] Two-Dimensional Confinement of Heavy Fermion in Artificial Superlattice
  • Author(s): 松田祐司
  • Organizer: International Conference on Strongly Correlated Electron Systems (SCES)
  • Place of Presentation: New Mexico, USA 招待講演
  • Year and Date: 00000627-00000702