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Study of Anomalous Metal-Insulator Transition of Filled Skutterudite-Type Compounds

Research Project

Project/Area Number 14540318
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionMURORAN INSTITUTE OF TECHNOLOGY

Principal Investigator

SEKINE Chihiro  MURORAN INSTITUTE OF TECHNOLOGY, Department of Electrical and Electronic Engineering, Associate Professor, 工学部, 助教授 (60261385)

Co-Investigator(Kenkyū-buntansha) LEE Chul-ho  MURORAN INSTITUTE OF TECHNOLOGY, (AIST), 電力エネルギー研究部門, 研究員 (80358358)
SHIROTANI Ichimin  MURORAN INSTITUTE OF TECHNOLOGY, Department of Electrical and Electronic Engineering, Professor, 工学部, 教授 (90110692)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 2003: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2002: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsSkutterudite / Metal-insulator transition / Nesting / Quadrupole transition / Structural phase transition / Antiferromagnetism / 金属リン化物 / 希土類化合物 / 強相関電子系
Research Abstract

PrRu_4P_<12> and SmRu_4P_<12> crystallized in the cubic filled skutterudite structure (space group Im-3) undergo a metal-insulator (M-I) transition at T_<MI>=62K and 16K, respectively. For PrRu_4P_<12>, various experiments suggest that the M-I transition is non-magnetic one of second order. To clarify the mechanism of the M-I transition, we have studied the crystal structure below T_<MI> using electron and synchrotron radiation X-ray diffraction. The superlattice spots were observed below T_<MI>. It is suggested that the space group of low temperature phase is Pm-3 For SmRu_4P_<12>. magnetic susceptibility clearly shows an anomaly at T_<MI> in contrast to PrRu_4P_<12>. We have measured in detail the specific heat, electrical resistivity and magnetization under high magnetic field. The detailed measurements have revealed that the M-I transition occuers in two successive steps. The field dependence up to 30T of the two anomalies suggests that the two successive transitions are antiferro-quadrupolar ordering and antiferro-magnetic order.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] C.Sekine: "Mgnetic phase diagram of filled skutterudite compound SmRu_4P_<12>"Acta Physica Plonica B. 34. 983-986 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] R.Giri: "Magnetic properties of Sm-based filled skutterudite phosphides"Physica B. 329-333. 458-459 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Fujiwara: "NMR study of magnetic properties in SmRu_4P_<12>"Physica B. 329-333. 476-477 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] C.H.Lee: "A study of the crystal structure at low temperature in the metal-insulator transition compound PrRu_4P_<12>"J.Magn.Magn.Mater.. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] L.Hao: "Crystal-lattice modulation of the metal-insulator transition system PrRu_4P_<12>"J.Magn.Magn.Mater.. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Matsunami: "Infrared study on the metal-insulator transition in filled skutterudites RRu_4P_<12> (R=Pr, Sm)"J.Magn.Magn.Mater.. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] C Sekine: "Magnetic phase diagram of filled skutterudite compound SmRu_4P_<12>"Acta Physica Polonica B. 34. 983-986 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] R Giri: "Magnetic properties of Sm-based filled skutterudite phosphides"Physica B. 329-333. 458-459 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Fujiwara: "NMR study of magnetic properties in SmRu_4P_<12>"Physica B. 329-333. 476-477 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] C.H.Lee: "A study of the crystal structure at low temperature in the metal-insulator transition compound PrRu_4P_<12>"J.Magn.Magn.Mater.. (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] L.Hao: "Crystal-lattice modulation of the metal-insulator transition system PrRu_4P_<12>"J.Magn.Magn.Mater.. (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Matsunami: "Infrared study on the metal-insulator transition in filled skutterudites RRu_4P_<12> (R=Pr,Sm)"J.Magn.Magn.Mater.. (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] C.Sekine: "Magnetic phase diagram of filled skutterudite compound SmRu_4P_<12>"Acta Physica Polonica B. 34. 983-986 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] R.Giri: "Magnetic properties of Sm-based filled skutterudite phosphides"Physica B. 329-333. 458-459 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Fujiwara: "NMR study of magnetic properties in SmRu_4P_<12>"Physica B. 329-333. 476-477 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] C.H.Lee: "A study of the crystal structure at low temperature in the metal-insulator transition compound PrRu_4P_<12>"J.Magn.Magn.Mater.. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] L.Hao: "Crystal-lattice modulation of the metal-insulator transition system PrRu_4P_<12>"J.Magn.Magn.Mater.. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Matsunami: "Infrared study on the metal-insulator transition in filled skutterudites RRu_4P_<12> (R=Pr,Sm)"J.Magn.Magn.Mater.. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] C.Sekine: "Magnetic phase diagram of filled skutterudite compound SmRu_4P_<12>"Acta Physica Polonica B. 34. 983-986 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] R.Giri: "Magnetic properties of Sm-based filled skutterudite phosphides"Physica B. 329-333 Part 2. 458-459 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Fujiwara: "NMR study of magnetic properties in SmRu_4P_<12>"Physica B. 329-333 Part 2. 476-477 (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2020-05-15  

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