Construction of effective model with realistic electronic structures of Strongly correlated electron systems and its analysis

• Project/Area Number: 19740195
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Saitama University
• Principal Investigator: IMAI Yoshiki Saitama University, 大学院・理工学研究科, 助教 (10396666)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥2,300,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥300,000); Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2008: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2007: ¥1,000,000 (Direct Cost: ¥1,000,000)
• Keywords: 強相関電子系 / 希土類化合物 / 第一原理計算

Research Abstract

For the strongly correlated electron systems, we constructed more accurate effective models and investigated physical properties quantitatively. In particular, we focus on the rare earth materials which are well known as the typical strongly correlated systems. Some physical quantities were calculated based on the constructed effective models. The obtained results were in good agreement with the experimental ones. We could propose the quantitative theoretical method to study the strongly correlated electron systems.

Research Products

• [Journal Article] (2010)
  • Author(s): Y. Imai, T. Saso
  • Journal Title: J. Phys.: Conf. Series 200,012066
  • Peer Reviewed
• [Journal Article] Origin of anomalous specific heat coefficient of YbAl_3 (2010)
  • Author(s): Y.Imai, T.Saso
  • Journal Title: Journal of Physics : Conference Series 200
  • Peer Reviewed
• [Journal Article] (2009)
  • Author(s): Y. Imai, T. Saso
  • Journal Title: J. Phys. Soc. Jpn. 78,064707 Pages: 1-7
  • Peer Reviewed
• [Journal Article] (2009)
  • Author(s): Y. Imai, T. Saso
  • Journal Title: J. Phys.: Conf. Series 150,042065
  • Peer Reviewed
• [Journal Article] Specific Heat-Coefficient of YbAl_3 Studied by Combined Nearly Free Electron Conduction Band Hybridized with Localized f Electrons with Correlation Effect (2009)
  • Author(s): Y.Imai, T.Saso
  • Journal Title: Journal of the Physical Society of Japan 78
  • NAID: 10025961462
  • Peer Reviewed
• [Journal Article] Correlation effect on effective model with realistic electronic structure fa r heavy fermion compound Ybals (2009)
  • Author(s): Y. Imai, T. Saso
  • Journal Title: Journal of Physics: Conference Series 150 Pages: 0420651-4
  • Peer Reviewed
• [Journal Article] Specific Heat-Coefficient of YbA13 Studied by Combined Nearly Free Ele ctron Conduction Band Hybridized with Localized f Electrons with Corr elation Effect (2009)
  • Author(s): Y. Imai, T. Saso
  • Journal Title: Journal of the Physical Society of Japan 78(掲載決定)
  • Peer Reviewed
• [Journal Article] (2008)
  • Author(s): H. Kuroiwa, Y. Imai, T. Saso
  • Journal Title: J. Phys. Soc. Jpn. 77,Suppl.A Pages: 196-198
  • Peer Reviewed
• [Journal Article] Construction of Effective Model for Heavy Fermion Metal Ybal_3 with H ybridization Effect between Nearly Free Electron Bands and f-states and its Analysis (2008)
  • Author(s): H. Kuroiwa, Y. Imai, T. Saso
  • Journal Title: Journal of the Physical Society of Japan, Suppl. A 77 Pages: 196-198
  • Peer Reviewed
• [Journal Article] Construction of Effective Model for Heavy Fermion Metal YbAl_3 with Hybridization Effect between Nearly Free Electron Bands and f-states and its Analysis (2008)
  • Author(s): H. Kuroiwa, Y. Imai, T. Saso
  • Journal Title: Journal of the Physical Society of Japan Suppl. A 77 Pages: 196-198
  • Peer Reviewed
• [Journal Article] (2007)
  • Author(s): H. Kuroiwa, Y. Imai, T. Saso
  • Journal Title: J. Phys. Soc. Jpn. 76,124704 Pages: 1-8
  • Peer Reviewed
• [Journal Article] (2007)
  • Author(s): T. Izumi, Y. Imai, T. Saso
  • Journal Title: J. Phys. Soc. Jpn. 76,084715 Pages: 1-4
  • Peer Reviewed
• [Journal Article] (2007)
  • Author(s): Y. Imai, T. Saso
  • Journal Title: Phys. Rev. B 75,165102 Pages: 1-8
  • Peer Reviewed
• [Journal Article] (2007)
  • Author(s): Y. Imai, K. Sakurazawa, T. Saso
  • Journal Title: J. Mag. Mag. Mat. 310 Pages: 243-245
  • Peer Reviewed
• [Journal Article] Absence of Hybridization Gap in Heavy Electron Systems and Analysis of YbAl_3 in terms of Nearly Free Electron Conduction Band (2007)
  • Author(s): H. Kuroiwa, Y. Imai, T. Saso
  • Journal Title: Journal of the Physical Society of Japan 76 Pages: 1247041-8
  • NAID: 110006532206
  • Peer Reviewed
• [Journal Article] Theory for Magnetic Anisotropy of Field-Induced Insulator-to-Metal Transition in Cubic Kondo Insulator YbB_12 (2007)
  • Author(s): T. Izumi, Y. Imai, T. Saso
  • Journal Title: Journal of the Physical Society of Japan 76 Pages: 847151-4
  • NAID: 110006366864
  • Peer Reviewed
• [Journal Article] Anomalous magnetic phase diagram in low-carrier two-band systems and possible application to CeOs_4Sb_12 (2007)
  • Author(s): Y. Imai, T. Saso
  • Journal Title: Physical Review B 75 Pages: 1651021-8
  • Peer Reviewed
• [Journal Article] Applications of path-integral renormalization group method combined with density functional theory (2007)
  • Author(s): Y. Imai, Y. Otsuka, M. Imada
  • Journal Title: Journal of Physics: Condensed Matter 19 Pages: 3652301-8
  • Peer Reviewed
• [Journal Article] Anomalous phase-diagram of filled skutterudite CeOs_4Sb_12 under external magnetic field (2007)
  • Author(s): Y. Imai, K. Sakurazawa, T. Saso
  • Journal Title: Journal of Magnetism and Magnetic Materials 310 Pages: 243-245
  • Peer Reviewed
• [Presentation] 重い電子系の形成と秩序化 (2009)
  • Author(s): 今井剛樹
  • Organizer: 新学術領域研究
  • Place of Presentation: 京都、関西セミナーハウス
  • Year and Date: 2009-11-24
• [Presentation] 現実的なバンド構造を考慮した強相関電子系の理論 (2009)
  • Author(s): 今井剛樹
  • Organizer: 新学術領域研究「重い電子系の形成と秩序化」若手秋の学校
  • Place of Presentation: 関西セミナーハウス、京都
  • Year and Date: 2009-11-24
• [Presentation] 重い電子系少数キャリアー物質における金属-絶縁体転移 (2009)
  • Author(s): 今井剛樹
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-25
• [Presentation] 25aPS-104 (2009)
  • Author(s): 今井剛樹、佐宗哲郎
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-22
• [Presentation] ICM2009, Mo-D-1. 1-40 (2009)
  • Author(s): Y. Imai, T. Saso
  • Organizer: ドイツ
  • Place of Presentation: カールスルーエ
  • Year and Date: 2009-07-27
• [Presentation] Origin of anomalous specific heat coefficient of YbAl_3 (2009)
  • Author(s): 今井剛樹
  • Organizer: International Conference on Magnetism
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2009-07-27
• [Presentation] Theory of anomalous specific heat-coefficient of Ybal (2009)
  • Author(s): 今井剛樹
  • Organizer: 新学術領域研究「重い電子系の形成と秩序化」第1回研究会
  • Place of Presentation: 東京大学物性研究所
  • Year and Date: 2009-03-11
• [Presentation] 22pQB-11 (2008)
  • Author(s): 今井剛樹, 佐宗哲郎
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22
• [Presentation] 重い電子系Ybal3における電子比熱の温度依存性の解析 (2008)
  • Author(s): 今井剛樹
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22
• [Presentation] LT26, PC-Mo172 (2008)
  • Author(s): Y. Imai, T. Saso
  • Organizer: オランダ・アムステルダム
  • Year and Date: 2008-08-11
• [Presentation] Correlation effect on effective model with realistic electronic structure for heavy fermion compound Ybala (2008)
  • Author(s): 今井 剛樹
  • Organizer: The 25th International Conference on Low Tempe rature Physics(LT25)
  • Place of Presentation: RAIコンベンションセンター、アムステルダム(オランダ)
  • Year and Date: 2008-08-11
• [Presentation] Construction of Effective Model for Heavy Fermion Metal YbAl3 with Hybridization Effect between Nearly Free Electron Bands and f-states and its Analysis (2007)
  • Author(s): 今井 剛樹
  • Organizer: Skutterudite 2007
  • Place of Presentation: 神戸大学
  • Year and Date: 2007-09-28
• [Presentation] 23pWE-6 (2007)
  • Author(s): 黒岩宏征, 今井剛樹, 佐宗哲郎
  • 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] CeOs4Sb12の特異な磁気相図の出現条件 (2007)
  • Author(s): 今井 剛樹
  • Organizer: 日本物理学会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-23
• [Presentation] Skutterudite 2007 (2007)
  • Author(s): 今井剛樹, 佐宗哲郎
  • Place of Presentation: 神戸大学
• [Remarks]
  • URL: http://sces.th.phy.saitama-u.ac.jp/~imai/
• [Remarks]
  • URL: http://sces.th.phy.saitama-u.ac.jp/~imai/research.htm
• [Remarks] 東京大学物性研究所
• [Remarks]
  • URL: http://sces.th.phy.saitama-u.ac.jp/~imai/research.htm