Theoretical study on electron-lattice coupled phenomena in organic conductors and transition metal oxides

• Project/Area Number: 18740221
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: SEO Hitoshi Japan Atomic Energy Agency, 量子ビーム応用研究部門, 研究職 (30415054)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,540,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥240,000); Fiscal Year 2008: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2007: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
• Keywords: 有機導体 / 分子性固体 / 遷移金属酸化物 / 物性理論 / 強相関電子系

Research Abstract

本研究では、有機導体および遷移金属酸化物で発見された新規な相転移現象に対する理論的解明を行った。これらの物質系の性質を決定つけるのは、従来より認識されていた価電子帯の電子の間の強いクーロン力と、本研究で明らかにした原子核の自由度との結合-電子格子相互作用-との絡み合いであり、本研究によって電子の持つ電荷やスピンの自由度とともに格子自由度が秩序化する現象のメカニズムを明らかにした。

Research Products

• [Journal Article] Spiral charge frustration in molecular conductor DI-DCNQI_2Ag (art. No.196403) (2009)
  • Author(s): H. Seo and Y. Motome
  • Journal Title: Physical Review Letters 102巻 Pages: 4-4
  • Peer Reviewed
• [Journal Article] Phase competitions and coexistences in quasi-one-dimensional molecular conductors: exact diaeonalization study (2009)
  • Author(s): 大塚雄一
  • Journal Title: Physica B 404 Pages: 479-481
  • Peer Reviewed
• [Journal Article] Finite-Temperature Phase Diagram of Quasi-One-Dimensional Molecular Conductors (art. No.113705) (2008)
  • Author(s): Y. Otsuka, H. Seo, Y. Motome, and T. Kato
  • Journal Title: Quantum Monte Carlo Study, Journal of the Physical Society of Japan 77巻 Pages: 4-4
  • Peer Reviewed
• [Journal Article] Single-Component Molecular Metals as Multi-Band π-d Systems (art. No. 023714) (2008)
  • Author(s): H. Seo, S. Ishibashi, Y. Okano, H. Kobayashi, A. Kobayshi, H. Fukuyama, and K. Terakura
  • Journal Title: Journal of the Physical Society of Japan 77巻 Pages: 4-4
  • Peer Reviewed
• [Journal Article] Finite-Temperature Phase Diagram of Quasi-Qne-Dimensional Molecular Conductors: Quantum Monte Carlo Study (2008)
  • Author(s): 大塚雄一
  • Journal Title: Journal of the Physical Society of Japan 77
  • Peer Reviewed
• [Journal Article] Mott insulating state in incommensurate molecular conductors (2008)
  • Author(s): 妹尾仁嗣
  • Journal Title: Journal of the Physics: Conference Series 132
  • Peer Reviewed
• [Journal Article] Single-Component Molecular Metals as Multi-Band pi-d Systems (2008)
  • Author(s): 妹尾仁嗣
  • Journal Title: Journal of the Physical Society of Japan 77
  • Peer Reviewed
• [Journal Article] Finite Temperature Phase Transitions in Quasi-One-Dimensional Molecular Conductors (art. No. 013707) (2007)
  • Author(s): H. Seo, Y. Motome, and T. Kato
  • Journal Title: Journal of the Physical Society of Japan 76巻 Pages: 4-4
  • Peer Reviewed
• [Journal Article] Charge-Ordered State versus Dimer-Mott Insulator at Finite Temperatures (2007)
  • Author(s): 吉岡英生
  • Journal Title: Journal of the Physical Society of Japan 76
  • Peer Reviewed
• [Journal Article] Finite Temperature Phase Transitions in Quasi-One-Dimensional Molecular Conductors (2007)
  • Author(s): 妹尾仁嗣
  • Journal Title: Journal of the Physical Society of Japan 76巻・1号 Pages: 13707-13707
  • NAID: 110006151540
• [Journal Article] Charge Fluctuations in Geometrically Frustrated Charge Ordered System (art. No. 114707) (2006)
  • Author(s): H. Seo, K. Tsutsui, M. Ogata, and J. Merino
  • Journal Title: Journal of the Physical Society of Japan 75巻 Pages: 8-8
  • Peer Reviewed
• [Journal Article] Theoretical Aspects of Charge Ordering in Molecular Conductors (2006)
  • Author(s): 妹尾仁嗣
  • Journal Title: Journal of the Physical Society of Japan 75巻・5号 Pages: 51009-51009
  • NAID: 110004702299
• [Journal Article] Finite-Temperature Charge-Ordering Transition and Fluctuation Effects in Quasi-One-Dimensional Electron Systems at Quarter Filling (2006)
  • Author(s): 吉岡英生
  • Journal Title: Journal of the Physical Society of Japan 75巻・6号 Pages: 63706-63706
• [Journal Article] Charge Fluctuations in Geometrically Frustrated Charge Ordered System (2006)
  • Author(s): 妹尾仁嗣
  • Journal Title: Journal of the Physical Society of Japan 75巻・11号 Pages: 114707-114707
  • NAID: 110004852771
• [Presentation] β-A_<1/3>V_2O_5の有効モデルと金属絶縁体転移 (2009)
  • Author(s): 妹尾仁嗣
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-29
• [Presentation] 1/2-filledからずれたκ_ET_4Hg_<3-x>X_8(X=Br,Cl)における不整合反強磁性状態 (2008)
  • Author(s): 妹尾仁嗣
  • 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] Charge frustration and novel electron lattice phase transition in molecular conductor DCNQI_2Ag (2008)
  • Author(s): H. Seo and Y. Motome
  • Organizer: 5th International Workshop on Electronic Crystals (ECRYS-2008)
  • Place of Presentation: Cargese France
  • Year and Date: 2008-08-26
• [Presentation] Charge frustration and novel electronlattiee phase transition in molecular conductor DI-DCNQI_2Ag (2008)
  • Author(s): 妹尾仁嗣
  • Organizer: 5th International Workshop on Electronic Crystals (ECRYS-2008)
  • Place of Presentation: Cargese, France
  • Year and Date: 2008-08-26
• [Presentation] (invited talk) : Incommensurate Mott insulator in molecular conductors with nonintegral stoichiometry (2008)
  • Author(s): H. Seo, H. Yoshioka, and Y. Otsuka
  • Organizer: International Symposium on Molecular Conductors 2008 (ISMC2008)
  • Place of Presentation: IMS Okazaki Japan.
  • Year and Date: 2008-07-24
• [Presentation] Incommensurate Mott insulator in molecular conductors with nonintegral stoichiometry (2008)
  • Author(s): 妹尾仁嗣
  • Organizer: International Symposium on Molecular Conductors 2008 (ISMC2008)
  • Place of Presentation: 分子科学研究所
  • Year and Date: 2008-07-24
• [Presentation] DI-DCNQI_2Agにおける電荷フラストレーションと新奇電子格子結合秩序化, (2008)
  • Author(s): 妹尾仁嗣
  • Organizer: 日本物理学会第63回年次大会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-24
• [Presentation] Charge frustration and novel electron-lattice coupled phase transition inorganic conductor DI-DCNQI_2Ag (2008)
  • Author(s): 妹尾仁嗣
  • Organizer: Annual APS March Meeting 2008
  • Place of Presentation: New Orleans, USA
  • Year and Date: 2008-03-10
• [Presentation] (contributed talk) : Theoretical Study of Single-Component Molecular Metals, 7th International Symposium on Organic Metals (2007)
  • Author(s): H. Seo, S. Ishibashi, Y. Okano, H. Kobayashi, A. Kobayashi, H. Fukuyama, and K. Terakura
  • Organizer: Superconductors, and Ferromagnets (ISCOM2007)
  • Place of Presentation: Peniscola Spain.
  • Year and Date: 2007-09-29
• [Presentation] Theoretical Study of Single-Component Molecular Metals (2007)
  • Author(s): 妹尾仁嗣
  • Organizer: 7th International Symposium on Organic Metals, Superconductors, and Ferromagnets(ISCOM2007)
  • Place of Presentation: Peniscola, Spain
  • Year and Date: 2007-09-27
• [Presentation] Au(tmdt)_2の電子構造と反強磁性状態 (2007)
  • Author(s): 妹尾仁嗣
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-23
• [Presentation] 分子性導体における拡張ハバードモデルによる理論研究およびその展望(若手奨励賞受賞記念講演) (2007)
  • Author(s): 妹尾仁嗣
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-21
• [Presentation] 分子性導体における拡張ハバードモデルによる理論研究およびその展望 (2007)
  • Author(s): 妹尾仁嗣
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-21