Critical antiferromagnetic and orbital fluctuations and superconductivity in heavy-fermion systems under pressure

• Project/Area Number: 20740189
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: HATTORI Kazumasa The University of Tokyo, 物性研究所, 助教 (30456199)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2010: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2009: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2008: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 強相関系 / 金属 / 超伝導・密度波 / 強相関電子系 / 物性理論

Research Abstract

We have investigated orbital fluctuations in heavy-fermion systems as a candidate for the pairing mechanism of superconductivity in these systems and analyzed their properties near a critical end point of these fluctuations.

Research Products

• [Journal Article] Kondo Effect of a Magnetic Ion Vibrating in a Harmonic Potential (2011)
  • Author(s): Satoshi Yashiki, Shunsuke Kirino, Kazumasa Hattori, Kazuo Ueda
  • Journal Title: J.Phys.Soc.Jpn. 80 Pages: 64701-64701
  • NAID: 40018844347
• [Journal Article] Phonon Dynamics and Multipolar Isomorphic Transition in beta-Pyrochlore KOs_2O_6 (2011)
  • Author(s): Kazumasa Hattori, H.Tsunetsugu
  • Journal Title: J.Phys.Soc.Jpn. 80 Pages: 23714-23714
• [Journal Article] Phonon Dynamics and Multipolar Isomorphic Transition in β-Pyrochlore KOs2O6 (2011)
  • Author(s): K.Hattori, H.Tsunetsugu
  • Journal Title: Journal of Physical Society of Japan Volume: 80
  • NAID: 40018273852
  • Peer Reviewed
• [Journal Article] Meta-Orbital Transition in Heavy-Fermion Systems : Analysis by Dynamical Mean Field Theory and Self-Consistent Renormalization Theory of Orbital Fluctuations (2010)
  • Author(s): Kazumasa Hattori
  • Journal Title: J.Phys.Soc.Jpn.selected as Editor's Choice. 79 Pages: 114717-114717
  • NAID: 40017366118
• [Journal Article] Enhanced charge fluctuation due to competitions between inter-site and Kondo-Yosida singlet formation in heavy-fermionsystems (2010)
  • Author(s): Kazumasa Hattori, Kazumasa Miyake
  • Journal Title: J.Phys.Soc.Jpn. 79 Pages: 73702-73702
• [Journal Article] Strong coupling superconductivity mediated by three-dimensional anharmonic phonons (2010)
  • Author(s): Kazumasa Hattori, Hirokazu Tsunetsugu
  • Journal Title: Phys.Rev.B 81 Pages: 134503-134503
• [Journal Article] Strong coupling superconductivity mediated by three-dimensional anharmonic phonons (2010)
  • Author(s): K.Hattori, H.Tsunetsugu
  • Journal Title: Physical Review B Volume: 81
  • Peer Reviewed
• [Journal Article] Enhanced Charge Fluctuations Due to Competitions between Intersite and Kondo-Yosida Singlet Formations in Heavy-Fermion Systems (2010)
  • Author(s): K.Hattori, K.Miyake
  • Journal Title: Journal of Physical Society of Japan Volume: 79
  • NAID: 40017205430
  • Peer Reviewed
• [Journal Article] Meta-Orbital Transition in Heavy-Fermion Systems : Analysis by Dynamical Mean Field Theory and Self-Consistent Renormalization Theory of Orbital Fluctuations (2010)
  • Author(s): K.Hattori
  • Journal Title: Journal of Physical Society of Japan Volume: 79
  • NAID: 40017366118
  • Peer Reviewed
• [Journal Article] Strong coupling superconductivity mediated by three-dimensional anharmonic phonons (2010)
  • Author(s): K.Hattori, H.Tsunetsugu
  • Journal Title: Physical Review B 81
  • Peer Reviewed
• [Journal Article] A Possible Isomorphic Transition in beta-pyrochlore Compounds (2009)
  • Author(s): Kazumasa Hattori, Hirokazu Tsunetsugu
  • Journal Title: J.Phys.Soc.Jpn. 78 Pages: 13603-13603
• [Journal Article] A Possible Isomorphic Transition in beta-pyroclore compounds (2009)
  • Author(s): Kazumasa HATTORI, Hirokazu TSUNETSUGU
  • Journal Title: Journal of Physical Society of Japan 78 Pages: 13603-1366
  • Peer Reviewed
• [Presentation] 二軌道アンダーソン模型における軌道揺らぎの解析 (2010)
  • Author(s): 服部一匡、常次宏一
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪府立大学23pWJ-3
  • Year and Date: 2010-09-23
• [Presentation] 二軌道アンダーソン模型における軌道揺らぎの解析 (2010)
  • Author(s): 服部一匡、常次宏一
  • 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] 和振動子と強結合超伝導の解析ベータパイロクロア化合物における非調 (2010)
  • Author(s): 服部一匡、常次宏一
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学21pGE-6
  • Year and Date: 2010-03-21
• [Presentation] Enhanced orbital fluctuations in a two-orbital Anderson lattice model (2010)
  • Author(s): K.Hattori
  • Organizer: International Conference on Heavy Electrons 2010
  • Place of Presentation: Tokyo, Japan
• [Presentation] Superconductivity mediated by anharmonic phonons : applicationtobeta-pyrochloreoxides (2010)
  • Author(s): K.Hattori, H.Tsunetsugu.
  • Organizer: APS march meeting, A40-10
  • Place of Presentation: Portland, USA
• [Presentation] Enhanced charge fluctuations due to competitions between intersite and Kondo-Yosida singlet formations in a two-impurity Anderson model (2010)
  • Author(s): K.Hattori
  • Organizer: Emergent Quantum States in Complex Correlated Matter
  • Place of Presentation: Dresden, Germany
• [Presentation] Enhanced orbital fluctuations in a two-orbital Anderson lattice model (2010)
  • Author(s): K.Hattori
  • Organizer: International Conference on Heavy Electrons 2010
  • Place of Presentation: Tokyo, Metropolitan University Tokyo, Japan
• [Presentation] Second Magnons in Non-collinearly Ordered Antiferromagnets (2010)
  • Author(s): K.Hattori
  • Organizer: Japan-Swiss Joint Work Shop New Trends in Theory of Correlated Materials
  • Place of Presentation: Seimei-no-mori Resort Chiba, Japan
• [Presentation] Superconductivity induced by three-dimensional anharmonic oscillators (2009)
  • Author(s): K.Hattori
  • Organizer: 文部科学省・科学研究補助金・新学術領域研究(研究領域提案型)「重い電子系の形成と秩序」第2回研究会
  • Place of Presentation: Higashihiroshima, Japan
  • Year and Date: 2009-08-18
• [Presentation] Evolution of Orbital Fluctuations in Two-orbital Anderson Lattice (2009)
  • Author(s): K.Hattori
  • Organizer: International Conference on Magnetism 2009
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2009-07-27
• [Presentation] Theory of anharmonic and anisotropic phonon systems (2009)
  • Author(s): K.Hattori
  • Organizer: ISSP International Workshop on New Develo pments in Theory of Superconductivity
  • Place of Presentation: Kashiwa, Japan
  • Year and Date: 2009-07-10
• [Presentation] Effects of Crystalline-electric-field in Two-orbital Anderson Lattice (2009)
  • Author(s): 服部一匡
  • Organizer: The First Meeting of Scientific Research on Innovative Area "Heavy Electrons"
  • Place of Presentation: 東京大学物性研究所
  • Year and Date: 2009-03-10
• [Presentation] Evolution of Orbital Fluctuations in Two-orbital Anderson Lattice (2009)
  • Author(s): Kerlsruhe Germany
  • Organizer: International Conference on Magnetism 2009 Mo-D-1.1-96
  • Place of Presentation: Kerlsurhe Germay
• [Presentation] Theory of anharmonic and anisotropic phonon systems (2009)
  • Author(s): K.Hattori, H.Tsunetsugu
  • Organizer: ISSP International Workshop on New Developments in Theory of Superconductivity, OC09
  • Place of Presentation: ISSP Univ.of Tokyo, Kashiwa, Japan
• [Presentation] 強相関系としての電子-非調和振動の物理 (2009)
  • Author(s): 服部一匡
  • Organizer: 文部科学省・科学研究補助金・新学術領域研究(研究領域提案型)「重い電子系の形成と秩序」重い電子系秋の学校
  • Place of Presentation: 関西セミナーハウス(京都)
• [Presentation] Superconductivity induced by three-dimensional anharmonic oscillators (2009)
  • Author(s): K.Hattori, H.Tsunetsugu
  • Organizer: 文部科学省・科学研究補助金・新学術領域研究(研究領域提案型)「重い電子系の形成と秩序」第2回研究会18b2
  • Place of Presentation: 広島大学東広島キャンパ
• [Remarks] ホームページ等
  • URL: http://sites.google.com/site/khathome/home
• [Remarks]
  • URL: http://sites.google.com/site/khathome/
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  • URL: http://tsune.issp.u-tokyo.ac.jp/research.html