Heavy electron states and superconductivity due to anharmonic phonons

• Project/Area Number: 20540347
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: UEDA Kazuo 東京大学, 物性研究所, 教授 (70114395)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2008: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 物性理論 / 強相関電子系 / 低温物性 / 磁性 / 近藤効果 / 非調和フォノン

Research Abstract

The spectral weight of an anharmonic oscillator coupled with conduction electrons is obtained. The ground-state phase diagram of the one dimensional Holstein model of anharmonic oscillators is determined by quantum Monte Carlo simulations. Kondo effect of magnetic ions vibrating in metals is investigated by using the numerical renormalization group method. We find two-channel Kondo effect at the border of the two different fixed points with different parities.

Research Products

• [Journal Article] Effect of Anharmonicity on the KondoPhenomena of a Magnetic Ion Vibratingin a Confinement Potential (2011)
  • Author(s): S. Yashiki and K. Ueda
  • Journal Title: J. Phys. Soc. Jpn Volume: 80
  • Peer Reviewed
• [Journal Article] Kondo Effect of a Magnetic Ion Vibrating in a Harmonic Potential (2011)
  • Author(s): S. Yashiki, S. Kirino, K. Hattori, and K. Ueda
  • Journal Title: J. Phys. Soc. Jpn Volume: 80
  • NAID: 210000109050
  • Peer Reviewed
• [Journal Article] Kondo Effect of a Vibrating Magnetic Ion (2011)
  • Author(s): S. Yashiki, S. Kirino, and K. Ueda
  • Journal Title: J. Phys. Soc. Jpn Volume: 80
  • Peer Reviewed
• [Journal Article] Kondo Effect of a Magnetic Ion Vibrating in a Harmonic Potential (2011)
  • Author(s): S.Yashiki, S.Kirino, K.Hattori, K.Ueda
  • Journal Title: J.Phys.Soc.Jpn. Volume: 80
  • NAID: 210000109050
  • Peer Reviewed
• [Journal Article] Effect of anharmonicity on the Kondo phenomena of a magnetic ion vibrating in a confinement potential (2011)
  • Author(s): S.Yashiki, K.Ueda
  • Journal Title: J.Phys.Soc.Jpn. Volume: 80
  • NAID: 210000109164
  • Peer Reviewed
• [Journal Article] Kondo Effect of a Vibrating Magnetic Impurity (2010)
  • Author(s): S. Yashiki, S. Kirino, and K. Ueda
  • Journal Title: J. Phys. Soc. Jpn Volume: 79
  • NAID: 40017284128
  • Peer Reviewed
• [Journal Article] Anharmonicity in One-Dimensional Electron-Phonon System (2010)
  • Author(s): J. Zhao and K. Ueda
  • Journal Title: J. Phys. Soc. Jpn Volume: 79
  • NAID: 40017205448
  • Peer Reviewed
• [Journal Article] Anharmonicity in One-Dimensional Electron-Phonon System (2010)
  • Author(s): J.Zhao, K.Ueda
  • Journal Title: J.Phys.Soc.Jpn. Volume: 79
  • NAID: 40017205448
  • Peer Reviewed
• [Journal Article] Green's Function of Fully Anharmonic Lattice Vibration (2009)
  • Author(s): M. Takechi and K. Ueda
  • Journal Title: J. Phys. Soc. Jpn Volume: 78
  • NAID: 110007097878
  • Peer Reviewed
• [Journal Article] 籠状構造中の非調和格子振動の理論的研究 (2009)
  • Author(s): 上田和夫
  • Journal Title: 日本物理学会誌 64 Pages: 378-382
  • NAID: 110007227208
  • Peer Reviewed
• [Journal Article] Green's Function of Fully Anharmonic Lattice Vibration (2009)
  • Author(s): M. Takechi and K. Ueda
  • Journal Title: J. Phys. Soc. Jpn 78
  • NAID: 110007097878
  • Peer Reviewed
• [Journal Article] Theoretical study of NMR relaxation due to rattling phonons (2008)
  • Author(s): T. Dahm and K. Ueda
  • Journal Title: J. Phys. Chem. Solids 69 Pages: 3160-3162
  • Peer Reviewed
• [Presentation] Kondo effects of a magnetic ion vibrating in a metal (2011)
  • Author(s): K.Ueda
  • Organizer: International Workshop on Electronic Correlations in Models and Materials
  • Place of Presentation: Augsburg, Germany(招待講演)
  • Year and Date: 2011-09-12
• [Presentation] ラットリングと電子系の相互作用 (2010)
  • Author(s): 上田和夫
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-24
• [Presentation] 振動する磁性不純物における近藤効果とYu-Anderson模型 (2010)
  • Author(s): 屋敷賢,桐野俊輔,上田和夫
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-23
• [Presentation] New Quantum States and Phenomena in Condensed Matter (2010)
  • Author(s): 上田和夫
  • Organizer: 11th Japanese-German Symposium
  • Place of Presentation: Hiroshima
  • Year and Date: 2010-09-14
• [Presentation] カゴ中を振動する磁性イオンの近藤効果 (2010)
  • Author(s): 屋敷賢,桐野俊輔,上田和夫
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-20
• [Presentation] 電子系と相互作用する非調和格子振動の理論 (2009)
  • Author(s): 竹地正輝,上田和夫
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-30
• [Presentation] 電子系と相互作用する非調和格子振動の理論 (2009)
  • Author(s): 竹地正輝,上田和夫
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大学池袋キャンパス
  • Year and Date: 2009-03-30
• [Presentation] 近藤効果の系譜-重い電子系と量子ドット- (2009)
  • Author(s): 上田和夫
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大学池袋キャンパス
  • Year and Date: 2009-03-29
• [Presentation] Theory of anharmonic lattice vibration of theβ-pyrochlore superconductors (2008)
  • Author(s): 上田和夫
  • Organizer: 10th German-Japanese Symposium-Collective Quantum-Phenomena in Correlated Condensed Matter Systems-
  • Place of Presentation: Ringberg Castle
  • Year and Date: 2008-09-30
• [Presentation] 重い電子系の起源-多体相関と電子格子相互作用の再検討- (2008)
  • Author(s): 上田和夫
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-20
• [Presentation] 重い電子系の起源-多体相関と電子格子相互作用の再検討- (2008)
  • Author(s): 上田和夫
  • Organizer: 日本物理学会第2008年秋季大会
  • Place of Presentation: 岩手大学上田キャンパス
  • Year and Date: 2008-09-20