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2007 Fiscal Year Annual Research Report

充填スクッテルダイト化合物が示す特徴的物性の理論的解明

Research Project

Project/Area Number 18027004
Research InstitutionTohoku University

Principal Investigator

倉本 義夫  Tohoku University, 大学院・理学研究科, 教授 (70111250)

Co-Investigator(Kenkyū-buntansha) 竹ヶ原 克彦  弘前大学, 大学院・理工学研究科, 教授 (80133924)
酒井 治  物質・材料研究機構, 量子ビームセンター, NIMS特別研究員 (60005957)
町田 一成  岡山大学, 大学院・自然科学研究科, 教授 (50025491)
紺谷 浩  名古屋大学, 大学院・理学研究科, 准教授 (90272533)
楠瀬 博明  愛媛大学, 大学院・理工学研究科, 准教授 (00292201)
Keywordsスクッテルダイト / 近藤効果 / 混成相互作用 / 結晶場 / 金属絶縁体転移 / 多極子 / 超伝導 / スカラー秩序
Research Abstract

理論班は,スクッテルダイト系における新奇現象理解への鍵となる概念形成を行い,全計画班の連携をサポートすることなどを主要な目標として活動した。その結果,以下を例とする多くの成果を得た。
1. Prスタッテルダイトでは,結晶場状態により,近藤効果の重要性が大きく異なることを微視的な計算によって示した。
2. PrFe4P12やPrRu4P12の秩序変数は,結晶の立方対称性を保つスカラー型であり,これが交替的に副格子を形成していることを提案し,温度に依存する結晶場状態など多くの実験を説明した。
3. SmRu4P12の奇妙な相図と物性について,磁気八極子が主要な秩序変数であることを確認し,CeB6との類似性から特徴的なNQRパターンなどを説明できることを指摘した。
4.多極子秩序による帯磁率,磁気異方性への反映を現象論を用いて明らかにした。これにより実験結果を多極子の描像によって合理的に解釈した。
5. PrFe4P12の複雑な核磁気共鳴スペクトルを対称性を考慮して解析し,スカラー型秩序変数の描像で説明できることを示した。
6.伝導電子のバンド構造が秩序構造に与える役割を明らかにした。特に結晶構造とリガンド電子の構造により強いネスティングが存在することが,多極子の反強的秩序形成に重要であることを示した。
7.スクッテルダイト特有の構造によるラトリングの役割に注目し,超音波物性に対する特有の効果を明らかにした。また磁場に鈍感な重い電子生成に導く可能性を指摘した。

  • Research Products

    (37 results)

All 2008 2007

All Journal Article (33 results) (of which Peer Reviewed: 33 results) Presentation (4 results)

  • [Journal Article] Consequence of Spatial Symmetry on 31P NMR Spectra in PrFe4P12 with Scalar Order2008

    • Author(s)
      Annamaria Kiss
    • Journal Title

      J. Phys. Soc. Jpn. A77

      Pages: 72-77

    • Peer Reviewed
  • [Journal Article] Toward Identification of Order Parameters in Skutterudites, -a Wonderland of Strong Correlation Physics-2008

    • Author(s)
      Yoshio Kuramoto
    • Journal Title

      J. Phys. Soc. Jpn. A77

      Pages: 187-192

    • Peer Reviewed
  • [Journal Article] Exact density matrix of the Gutzwiller wave function as the ground state of the inverse-square supersymmetric t-J model. II. Minority spin component2008

    • Author(s)
      Onuttom Narayan
    • Journal Title

      Phys. Rev. B77

      Pages: 045114-1-045114-14

    • Peer Reviewed
  • [Journal Article] Phenomenological Theory of a Scalar Electronic Order : Application to Skutterudite PrFe4P122008

    • Author(s)
      Annamaria Kiss
    • Journal Title

      J. Phys. Soc. Jpn. 77

      Pages: 034602-1-034602-9

    • Peer Reviewed
  • [Journal Article] Fermi surface of the filled skutterudite LaOs_4P_<12>2008

    • Author(s)
      H. Harima
    • Journal Title

      Physica B 403

      Pages: 906-908

    • Peer Reviewed
  • [Journal Article] Electronic band structure for SmOs_4Sb_<12>2008

    • Author(s)
      K. Takegahara
    • Journal Title

      J. Phys. Soc. Jpn. A77

      Pages: 193-195

    • Peer Reviewed
  • [Journal Article] Electronic structures for alkaline-earth filled skutterudite antimonides2008

    • Author(s)
      K. Takegahara
    • Journal Title

      J. Phys. Soc. Jpn. A77

      Pages: 294-296

    • Peer Reviewed
  • [Journal Article] Local static distortion of rare earth ions in ROs_4Sb_<12> (R=La, Ce, Pr, Nd, Sm) by extended x-ray absorption fine structure2008

    • Author(s)
      K. Nitta
    • Journal Title

      J. Phys. Soc. Jpn. 77

      Pages: 063601(1-3)

    • Peer Reviewed
  • [Journal Article] Extension of Dynamical Mean-Field Theory : Inclusion of Spatial Fluctuations2008

    • Author(s)
      H. Kusunose
    • Journal Title

      J. Phys. Soc. Jpn. Suppl. 77

      Pages: 202-205

    • Peer Reviewed
  • [Journal Article] Description of Multipole in f-Electron Systems2008

    • Author(s)
      H. Kusunose
    • Journal Title

      J. Phys. Soc. Jpn. 77

      Pages: 064710(1-18)

    • Peer Reviewed
  • [Journal Article] Spin-Dependent Mass Enhancement under Magnetic Field in the Periodic Anderson Model2008

    • Author(s)
      S. Onari
    • Journal Title

      J. Phys. Soc. Jpn. 77

      Pages: 023703

    • Peer Reviewed
  • [Journal Article] Magnetotransport properties governed by antiferromagnetic fluctuations in the heavy-fermion superconductor CeIrIn_52008

    • Author(s)
      R. Settai
    • Journal Title

      Phys. Rev. B 77

      Pages: 214504(1-7)

    • Peer Reviewed
  • [Journal Article] Anomalous Transport Phenomena in Fermi Liquids with Strong Magnetic Fluctuations2008

    • Author(s)
      H. Kontani
    • Journal Title

      Rep. Prog. Phys. 71

      Pages: 026501(1-52)

    • Peer Reviewed
  • [Journal Article] 多極子秩序とNMR測定によるその同定2008

    • Author(s)
      酒井治
    • Journal Title

      日本物理学会誌 63

      Pages: 427-434

    • Peer Reviewed
  • [Journal Article] The de Haas-van Alphen Effect in Kondo Systems with Crystalline Electric Field2007

    • Author(s)
      J. Otsuki
    • Journal Title

      J. Magn. Magn. Mater. 310

      Pages: 425-427

    • Peer Reviewed
  • [Journal Article] A Partially Solved Jigsaw Puzzle on Electronic Orders in Skutterudites2007

    • Author(s)
      Y. Kuramoto
    • Journal Title

      JPSJ Online-News and Comments Apr. 13

    • Peer Reviewed
  • [Journal Article] Continuous-Time Quantum Monte Carlo Method for the Coqblin-Schrieffer Model2007

    • Author(s)
      J. Otsuki
    • Journal Title

      J. Phys. Soc. Jpn. 76

      Pages: 114707-1-114707-11

    • Peer Reviewed
  • [Journal Article] Analysis of hyperfine interactions in NMR studies of Pr-skutterudites2007

    • Author(s)
      O. Sakai
    • Journal Title

      J. Phys. Chem. Solids 68

      Pages: 2084-2086

    • Peer Reviewed
  • [Journal Article] DMFT band calculation for Ce compounds2007

    • Author(s)
      O. Sakai
    • Journal Title

      J. Magn. Magn. Mater. 310

      Pages: 374-376

    • Peer Reviewed
  • [Journal Article] Band Calculation for Ce-pnictides on the basis of Dynamical Mean Field Theory2007

    • Author(s)
      O. Sakai
    • Journal Title

      J. Phys. Soc. Jpn. 76

      Pages: 044707-1-044707-13

    • Peer Reviewed
  • [Journal Article] Band Calculation for 4f Systems based on the Dynamical Mean Field Theory2007

    • Author(s)
      O. Sakai
    • Journal Title

      J. Phys. C 19

      Pages: 365213-1-365213-8

    • Peer Reviewed
  • [Journal Article] Experimental and Theoretical Studies of NMR in PreFe_4P_<12>-Suggestion of Antiferro-monopole Type Ordering-2007

    • Author(s)
      O. Sakai
    • Journal Title

      J. Phys. Soc. Jpn. 76

      Pages: 024710-1 024710-13

    • Peer Reviewed
  • [Journal Article] Electronic band structures in LaRu_4P_<12> and LaFe_4P_<12> with modulated skutterudite structures2007

    • Author(s)
      K. Takegahara
    • Journal Title

      J. Magn. Magn. Mater. 310

      Pages: 861-863

    • Peer Reviewed
  • [Journal Article] EXAFS study of filled skutterudites PrOs_4Sb_<12> and LaOs_4Sb_<12>2007

    • Author(s)
      K. Nitta
    • Journal Title

      Proccedings on XAFS 13, AIP Conf. Proc. 882

      Pages: 265-267

    • Peer Reviewed
  • [Journal Article] Magnetic Octupole Observed by Neutron Scattering : A Route toward Visible Order2007

    • Author(s)
      H. Kusunose
    • Journal Title

      JPSJ Online-News and Comments Sep. 10

    • Peer Reviewed
  • [Journal Article] Intrinsic anomaloous Hall effect in ferromagnetic metals studied by the multi- d -orbital tight-binding model2007

    • Author(s)
      H. Kotani
    • Journal Title

      Phys. Rev. B 75

      Pages: 184416(1-11)

    • Peer Reviewed
  • [Journal Article] Theory of Infrared Hall Conductivity Based on the Fermi Liquid Theory2007

    • Author(s)
      H. Kontani
    • Journal Title

      J. Phys. Soc. Jpn. 76

      Pages: 074707(1-16)

    • Peer Reviewed
  • [Journal Article] Electronic thermal conductivity in a superconducting vortex state2007

    • Author(s)
      H. Adachi
    • Journal Title

      Physica C 463-465

      Pages: 36-39

    • Peer Reviewed
  • [Journal Article] Macroscopic manifestations of broken inversion symmetry in noncentrosymmetric superconductors with applied magnetic field2007

    • Author(s)
      M. Oka
    • Journal Title

      J. Magn. Magn. Mater 310

      Pages: 575-577.

    • Peer Reviewed
  • [Journal Article] Vortex state in FFLO superconductors2007

    • Author(s)
      M. Ichioka
    • Journal Title

      J. Magn. Magn. Mater 310

      Pages: 593-595

    • Peer Reviewed
  • [Journal Article] Quasiclassical calculation of the quasiparticle thermal conductivity in a mixed state2007

    • Author(s)
      H. Adachi
    • Journal Title

      J. Magn. Magn. Mater 310

      Pages: 640-642

    • Peer Reviewed
  • [Journal Article] The superconducting gap structure of PrOs_4Sb_<12> and CeRu_2 probed by C(H,φ)2007

    • Author(s)
      J. Custers
    • Journal Title

      J. Magn. Magn. Mater 310

      Pages: 700-702

    • Peer Reviewed
  • [Journal Article] Experimental and Theoretical Studies of NMR in PrFe_4P_<12>-Suggestion of the Local Monopole Type Ordering-2007

    • Author(s)
      O. Sakai
    • Journal Title

      J. Phys. Soc. Jpn. 76

      Pages: 024710-1-13

    • Peer Reviewed
  • [Presentation] Skutterudite as a Wonderland of Strong Correlatoin Physics2007

    • Author(s)
      Yoshio Kuramoto
    • Organizer
      International Conference on New Quantum Phenomena in Skutterudite and Related Systems (Skutterudite2007)
    • Place of Presentation
      神戸大学 六甲台キャンパス
    • Year and Date
      2007-09-30
  • [Presentation] Consequence of Spatial Symmetry on 31P NMR Spectra in PrFe4P12 with Scalar Order2007

    • Author(s)
      Annamaria Kiss
    • Organizer
      International Conference on New Quantum Phenomena in Skutterudite and Related Systems (Skutterudite2007)
    • Place of Presentation
      神戸大学 六甲台キャンパス
    • Year and Date
      2007-09-28
  • [Presentation] DMFT Band Calculation for Ce-compounds with AuCu3-type Structure2007

    • Author(s)
      Osamu Sakai
    • Organizer
      International Conference on New Quantum Phenomena in Skutterudite and Related Systems (Skutterudite2007)
    • Place of Presentation
      神戸大学 六甲台キャンパス
    • Year and Date
      2007-09-28
  • [Presentation] Extension of dynamical mean-field theory : Inclusion of spatial fluctuations2007

    • Author(s)
      Hiroaki Kusunose
    • Organizer
      International Conference on New Quantum Phenomena in Skutterudite and Related Systems (Skutterudite2007)
    • Place of Presentation
      神戸大学 六甲台キャンパス
    • Year and Date
      2007-09-28

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Published: 2010-06-11   Modified: 2016-04-21  

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