Novel Transport Phenomena due to Orbital Degree of Freedoms

• Project/Area Number: 21540358
• 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: Nagoya University
• Principal Investigator: KONTANI Hiroshi 名古屋大学, 理学研究科, 教授 (90272533)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 強相関電子系 / 高温超伝導 / 鉄系超伝導体 / 銅酸化物高温超伝導体 / 重い電子 / 輸送現象 / 量子臨界現象 / 軌道揺らぎ / スピン揺らぎ / 重い電子系 / 軌道自由度 / 軌道秩序 / フェルミ液体理論 / スピンホール効果

Research Abstract

We studied the many-body electronic states in metals with orbital degree of freedoms. The main objects are (i) spin Hall effect and anomalous Hall effect driven by the Berry phase due to orbital degree of freedoms and spin-orbit coupling (orbital Berry phase), and (ii) the mechanism of superconductivity and anomalous transport phenomena due to orbital fluctuations driven by Coulomb interaction.

Research Products

• [Journal Article] Spin-Fluctuation-Driven Orbital Nematic Order in Ru-Oxides (2013)
  • Author(s): Yusuke Ohno, Masahisa Tsuchiizu, Seiichiro Onari, and Hiroshi Kontani
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 1 Pages: 013707-013707
  • DOI: 10.7566/jpsj.82.013707
  • Peer Reviewed
• [Journal Article] Extrinsic Spin Hall Effect due to Transition-Metal Impurities (2012)
  • Author(s): Takuro Tanaka, Hiroshi Kontani
  • Journal Title: Prog. Theor. Phys. Volume: 128 Issue: 5 Pages: 805-828
  • DOI: 10.1143/ptp.128.805
  • NAID: 110009553537
  • Peer Reviewed
• [Journal Article] Self-consistent Vertex Correction Analysis for Iron-based Superconductors: Mechanism of Coulomb Interaction-Driven Orbital Fluctuations (2012)
  • Author(s): S. Onari and H. Kontani
  • Journal Title: Phys. Rev. Lett Volume: 109 Issue: 13
  • DOI: 10.1103/physrevlett.109.137001
  • Peer Reviewed
• [Journal Article] Emergence of fully gapped s++-wave and nodal d-wave states mediated by orbital and spin fluctuations in a ten-orbital model of KFe2Se2 (2011)
  • Author(s): T.Saito, S.Onari, H.Kontani
  • Journal Title: Phys.Rev.B Volume: 83
  • Peer Reviewed
• [Journal Article] rigin of Orthorhombic Transition, Magnetic Transition, and Shear Modulus Softening in Iron Pnictide Superconductors (2011)
  • Author(s): H.Kontani, T.Saito, S.Onari
  • Journal Title: Phys.Rev.B Volume: 84 Pages: 0245281-17
  • Peer Reviewed
• [Journal Article] Neutron inelastic scattering peak by dissipationless mechanism in the s++-wave state in iron-based superconductors (2011)
  • Author(s): S.Onari, H.Kontani
  • Journal Title: Phys.Rev.B Volume: 84 Pages: 1445181-9
  • Peer Reviewed
• [Journal Article] Orbital-Fluctuation-mediated Superconductivity in Iron Pnictides : Analys is of the Five-Orbital Hubbard Holstein Model. (2010)
  • Author(s): H.Kontani, S.Onari
  • Journal Title: Phys.Rev.Lett. Volume: 104
  • Peer Reviewed
• [Journal Article] Ornital fluctuation theory in iron pnictides : Effects of As-Fe-As bond angle, isotope substitution, and Z2-orbital pocket on superconductivity (2010)
  • Author(s): T.Saito, S.Onari, H.Kontani
  • Journal Title: Phys.Rev.B Volume: 82
  • Peer Reviewed
• [Journal Article] Anomalous Hall effect due to noncollinearity in pyrocblore compounds : Role of orbital Aharonov-Bohm effect (2010)
  • Author(s): T.Tomizawa, H.Kontani
  • Journal Title: Phys.Rev.B Volume: 82
  • Peer Reviewed
• [Presentation] Development of orbital and spin fluctuations in Fe-based Superconductors (2013)
  • Author(s): Hiroshi Kontani
  • Organizer: APS March Meeting
  • Place of Presentation: Baltimore, MD
  • Year and Date: 2013-03-19
• [Presentation] Development of orbital and spin fluctuations in Fe-based Superconductors (2013)
  • Author(s): Hiroshi Kontani
  • Organizer: APS March Meeting
  • Place of Presentation: Baltimore, MD, USA
  • Invited
• [Presentation] Orbital fluctuation theory in Fe-based superconductors (2011)
  • Author(s): H.Kontani
  • Organizer: 26th International Conference on Low Temperature Physics (LT26)
  • Place of Presentation: Institute of Physics, Chinese Academy of Sciences(招待講演)
  • Year and Date: 2011-08-13
• [Presentation] Orbital fluctuation mediated superconductivity in iron pnictides : Analysis of multiorbital Hubbard-Holstein model (2010)
  • Author(s): H.Kontani
  • Organizer: 11th German-Japanese Symposium
  • Place of Presentation: Aki Grand Hotel, Hiroshima
  • Year and Date: 2010-09-14
• [Book] Transport Phenomena in Strongly Correlated Fermi Liquids (2013)
  • Author(s): Hiroshi Kontani
  • Total Pages: 185
  • Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. K
• [Book] Transport Phenomena in Strongly Correlated Fermi Liquids (185p) (2012)
  • Author(s): Hiroshi Kontani
  • Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. K
• [Remarks]
  • URL: http://www.slab.phys.nagoya-u.ac.jp/kon