Theoretical study of electronic states and transport phenomena in inmohogeneous strongly correlated electron systems

• Project/Area Number: 18740197
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Nagoya University
• Principal Investigator: KONTANI Hiroshi Nagoya University, 理学研究科, 准教授 (90272533)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,800,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥300,000); Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2007: ¥1,200,000 (Direct Cost: ¥1,200,000); Fiscal Year 2006: ¥1,300,000 (Direct Cost: ¥1,300,000)
• Keywords: 強相関電子系 / 輸送現象 / 超伝導現象 / 高温超伝導体 / 重い電子系 / 有機物超伝導体 / 不純物効果 / 異常ホール効果 / スピンホール効果 / 量子臨界現象 / 光学ホール係数 / バーテックス補正 / 超伝導発現機構

Research Abstract

反強磁性量子臨界点(AF-QCP)近傍の強相関電子系では、わずか1%の非磁性不純物が系全体の電子状態を劇的に変化させることが知られている。たとえば銅酸化物高温超伝導体では、1%のZn不純物により巨大な残留抵抗が生じたり、1μBに達する大きな局在モーメントが発生する。今回我々は、FLEX近似を拡張して空間的に非一様な状態に適用できる近似理論(GVI理論)を開発して、高温超伝導体における非磁性不純物問題を解析した。その結果、上記の実験事実を第一原理的に再現することに始めて成功した。その後、我々は鉄砒素系高温超伝導体における不純物効果を研究し、超伝導対称性に関する重要な知見を得た。さらに我々はAg金属中におけるYb不純物が、Ybの電子相関によって劇的に大きなスピンホール効果をもたらすことを理論的に予言した。

Research Products

• [Journal Article] Impurity-induced in-gap state and Tc in sign-reversing s-wave superconductors: analysis of iron oxypnictide superconductors (2009)
  • Author(s): Y. Senga and H. Kontani
  • Journal Title: New J. Phys. 11
  • Peer Reviewed
• [Journal Article] Intrinsic spin Hall effect in the s-wave superconducting state: Analysis of the Rashba model (2009)
  • Author(s): H. Kontani, J. Goryo, and D. S. Hirashima
  • Journal Title: Phys. Rev. Lett. 102
  • Peer Reviewed
• [Journal Article] Giant extrinsic spin Hall effect due to rare-earth impurities (2009)
  • Author(s): T. Tanaka and H. Kontani
  • Journal Title: New J. Phys. 11
  • Peer Reviewed
• [Journal Article] Giant orbital Hall effect in transition metals: Origin of large spin and anomalous Hall effect (2009)
  • Author(s): H. Kontani, T. Tanaka, D. S. Hirashima, K. Yamada, and J. Inoue
  • Journal Title: Phys. Rev. Lett. 102
  • Peer Reviewed
• [Journal Article] Impurity effects in sign-reversing fully gapped superconductors: Analysis of FeAs superconductors (2009)
  • Author(s): Y. Senga and H. Kontani
  • Journal Title: J. Phys. Soc. Jpn. 77
  • NAID: 110006983732
  • Peer Reviewed
• [Journal Article] Giant orbital Hall effect in transition metals : Origin of large spin and anomalous Hall effect (2009)
  • Author(s): H. Kontani, T. Tanaka, D. S. Hirashima, K. Yamada, and J. Inoue
  • Journal Title: Physical Review Letters 102
  • Peer Reviewed
• [Journal Article] Intrinsic spin Hall effect in the s-wave superconducting state : Analysis of the Rashba model (2009)
  • Author(s): H. Kontani, J. Goryo, and D. S. Hirashima
  • Journal Title: Physical Review Letters 102
  • Peer Reviewed
• [Journal Article] s-wave superconductivity due to Shul-Kondo mechanism in NaxCoO2・yH2O: Effect of Coulomb interaction and trigonal distortion (2008)
  • Author(s): K. Yada and H. Kontani
  • Journal Title: Phys. Rev. B 77
  • Peer Reviewed
• [Journal Article] Intrinsic spin Hall effect and orbital Hall effect in 4d and 5d transition metals (2008)
  • Author(s): T. Tanaka, H. Kontani, M. Naito, T. Naito, D. S. Hirashima, K. Yamada, and J. Inoue
  • Journal Title: Phys. Rev. B 77
  • Peer Reviewed
• [Journal Article] Magnetotransport properties governed by antifferomagnetic fluctuations in the heavy fermion superconductor CeIrIn5 (2008)
  • Author(s): Y. Nakajima, Y. Shishido, H. Nakai, T. Shibauchi, M. Hedo, Y. Uwatoko, T. Matsumoto, R. Settai, Y. Ohnuki, H. Kontani, and Y. Matsuda
  • Journal Title: Phys. Rev. B 77
  • Peer Reviewed
• [Journal Article] Unconventional pairing originating from the disconnected Fermi surfaces of superconducting LaFeAsO1-xFx (2008)
  • Author(s): K. Kuroki, S. Onari, R. Arita, H. Usui, Y. Tanaka, H. Kontani, and H. Aoki
  • Journal Title: Phys. Rev. Lett. 101
  • Peer Reviewed
• [Journal Article] Intrinsic spin Hall effect and orbital Hall effect in 4d and 5d transition metals (2008)
  • Author(s): T. Tanaka, H. Kontani, M. Naito, T. Naito, D. S. Hirashima, K. Yamada, and J. Inoue
  • Journal Title: Physical Review B 77
  • Peer Reviewed
• [Journal Article] Giant Intrinsic Spin and Orbital Hall Effects in Sr2MO4 (M=Ru,Rh,Mo) (2008)
  • Author(s): H. Kontani, T. Tanaka, D.S. Hirashima, K. Yamada, and J. Inoue
  • Journal Title: Physical Review Letters 100 Pages: 966014-966014
• [Journal Article] Anomalous Transport Phenomena in Fermi Liquids with Strong Magnetic Fluctuations (2008)
  • Author(s): H. Kontani
  • Journal Title: Reports on Progress in Physics 71 Pages: 2650152-2650152
  • Peer Reviewed
• [Journal Article] Theory of Thermal Conductivity in High-Tc Superconductors below Tc (2007)
  • Author(s): H. Hara, and H. Kontan
  • Journal Title: Journal of the Physical Society of Japan 76 Pages: 737054-737054
  • Peer Reviewed
• [Journal Article] Non-Fermi Liquid Behavior in the Magnetotransport of CeMIn5 (M: Co and Rh): Striking Similarity between Quasi Two-Dimensional Heavy Fermion and High-Tc Cuprates (2007)
  • Author(s): Y. Nakajima, H. Shishido, H. Nakai, T. Shibauchi, K. Behnia, K. Izawa, M. Hedo, Y. Uwatoko, T. Matsumoto, R. Settai, Y. Onuki, H. Kontani, and Y. Matsuda
  • Journal Title: Physical Review B 76 Pages: 2470315-2470315
  • Peer Reviewed
• [Journal Article] Infrared Hall conductivity in optimally doped Bi2Sr2CaCu2O8+δ: Drude behavior examined by experiment and fluctuation-exchange-model calculations (2007)
  • Author(s): D. C. Schmadel, G. S. Jenkins, J. J. Tu, G. D. Gu, H. Kontani, and H. D. Drew
  • Journal Title: Journal of the Physical Society of Japan 75 Pages: 1405064-1405064
  • Peer Reviewed
• [Journal Article] Intrinsic anomalous Hall effect in ferromagnetic metals studied by the multi- d -orbital tight-binding model (2007)
  • Author(s): Hiroshi Kontani, Takuro Tanaka, and Kosaku Yamada
  • Journal Title: Physical Review B 75 Pages: 18441611-18441611
  • Peer Reviewed
• [Journal Article] Study of intrinsic spin and orbital Hall effects in Pt based on a (6s,6p,5d) tight-binding model (2007)
  • Author(s): H. Kontani, M. Naoto, D. S. Hirashima, K. Yamada and J. Inoue
  • Journal Title: Journal of the Physical Society of Japan 76 Pages: 1037024-1037024
  • NAID: 110006448292
  • Peer Reviewed
• [Journal Article] Non-Fermi Liquid Behavior in the Magnetotransport of CeM ln5 (M : Co and Rh) : Striking Similarity between Quasi Two-Dimensional Heavy Fermion and High-Tc Cuprates (2007)
  • Author(s): Y.Nakajima, H.Shishido, H.Nakai, T.Shibauchi, K.Behnia, K.Izawa, M.Hedo, Y.Uwatoko, T.Matsumoto, R.Settai, Y.Onuki, H.Kontani, Y.Matsuda
  • Journal Title: J. Phys. Soc. Jpn. 76・2
• [Journal Article] Theoretical Study of the Phase Diagram of β'-(BEDT TTF)2AuCl2 at Hydrostatic Pressure (2006)
  • Author(s): H.Kino, H.Kontani, T.Miyazaki
  • Journal Title: J. Phys. Soc. Jpn. 75・10
• [Journal Article] Transport phenomena in a three-dimensional system close to the magnetic quantum critical point : The conserving approximation with current vertex corrections (2006)
  • Author(s): S.Onari, H.Kontani, Y.Tanaka
  • Journal Title: Phys. Rev. B 73・22
  • NAID: 120000979812
• [Journal Article] Effect of a nonmagnetic impurity in a nearly antiferromagnetic Fermi liquid : Magnetic correlations and transport phenomena (2006)
  • Author(s): H.Kontani, M.Ohno
  • Journal Title: Phys. Rev. B 74・1
• [Journal Article] Optical conductivity of bad metals : Shift of the Drude peak (2006)
  • Author(s): T.Mutou, H.Kontani
  • Journal Title: Phys. Rev. B 74 74・11
• [Presentation] 電子ドープ系高温超伝導体における直流/交流ホール効果の理論解析 (2009)
  • Author(s): 紺谷浩, D.H. Drew
  • Organizer: 日本物理学会2008年春季大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-30
• [Presentation] 非自明な磁気構造に由来する異常ホール効果の理論 (2009)
  • Author(s): 富澤剛, 紺谷浩
  • Organizer: 日本物理学会2008年春季大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-29
• [Presentation] 鉄砒素系超伝導体の超伝導状態における不純物効果 (2009)
  • Author(s): 千賀裕子、紺谷浩
  • Organizer: 日本物理学会2008年春季大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-28
• [Presentation] 磁性不純物に起因する外因性スピンホール効果の理論II (2009)
  • Author(s): 田中拓郎, 紺谷浩
  • Organizer: 日本物理学会2008年春季大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-27
• [Presentation] Theory of anomalous transport phenomena in high-Tc superconductors (2008)
  • Author(s): H. Kontani
  • Organizer: 21 st International Conference on Superconductivity
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2008-10-28
• [Presentation] 3d強磁性金属における異常ホール効果 (2008)
  • Author(s): 内藤隆, 平島大, 紺谷浩, 田中拓郎
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-23
• [Presentation] d電子系における内因性ホール効果の起源 : 軌道流の効果 (2008)
  • Author(s): 紺谷浩, 田中拓郎, 平島大, 山田耕作, 井上順一郎
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-23
• [Presentation] NaxCoO2yH2Oにおける不純物効果の理論的解析 (2008)
  • Author(s): 千賀裕子、紺谷浩
  • Organizer: 日物理学会2008年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22
• [Presentation] 超伝導状態における内因性スピンホール効果の理論 (2008)
  • Author(s): 紺谷浩, 御領潤, 平島大
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22
• [Presentation] d軌道強束縛模型に基づく外因性スピンホール効果の理論 (2008)
  • Author(s): 紺谷浩
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-21
• [Presentation] 強束縛系における異常ホール効果 (領域8 シンポジウム) (2008)
  • Author(s): 紺谷浩
  • Organizer: 日本物理学会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-24
• [Presentation] 多軌道強束縛模型に基づくカイラリティー起源の異常ホール効果め理論 (2008)
  • Author(s): 紺谷浩
  • Organizer: 日本物理学会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-24
• [Presentation] Theory of anomalous transport phenomena in high-Tc superconductors (2008)
  • Author(s): H. Kontani
  • Organizer: 21st International Conference on Superconductivity
  • Place of Presentation: Tsukuba, Japan
• [Presentation] Novel Intrinsic Hall Effecct in d,f-Electron Systems (2008)
  • Author(s): H. Kontani
  • Organizer: The 23rd Nishinomita-Yukawa Memorial International Workshop, Spin Transport in Condensed Matter
  • Place of Presentation: Kyoto, Japan
• [Presentation] 強相関電子系における輸送現象の理論的研究(領域8 若手奨励賞受賞講演) (2007)
  • Author(s): 紺谷浩
  • Organizer: 日本物理学会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-21
• [Remarks]
  • URL: http://www.slab.phys.nagoya-u.ac.jp/kon/
• [Remarks]
  • URL: http://www.slab.phys.nagoya-u.ac.jp/kon/