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Pressure-induced insulator-metal transition in transition metal chalcogenides studied by nuclear resonant inelastic scattering

Research Project

Project/Area Number 15540319
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics I
Research InstitutionUniversity of Hyogo (2004)
Himeji Institute of Technology (2003)

Principal Investigator

KOBAYASHI Hisao  University of Hyogo, Graduate School of Material Science, Associate Prof., 大学院・物質理学研究科, 助教授 (40250675)

Co-Investigator(Kenkyū-buntansha) SAKAI Nobuhiko  University of Hyogo, Graduate School of Material Science, Prof., 大学院・物質理学研究科, 教授 (60013497)
MORI Nobuo  Saitama University, Department of Physics, Prof., 理学部, 教授 (40000848)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2003: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsHigh Pressure / Phonon / Insulator-metal transition / Nuclear resonant inelastic scattering / 電荷圧縮率
Research Abstract

Iron sulfide, FeS, has been attracting attention in geosciences as well as condensed matter physics. Although the pressure vs.temperature phase diagram has been contradictory, FeS undergoes two successive first-order phase transitions at room temperature, from the troilite to an MnP-type structure at 3.5 GPa and then to a monoclinic structure at 6.5 GPa. At ambient conditions, FeS is an antiferromagnetic semiconductor, where an electron correlation plays an important role. Electrical resistivity measurements of FeS under pressure show that the semiconductor-metal and metal-semiconductor transitions occur at 3.5 and 6.5 GPa, respectively, corresponding to the structural phase transitions at room temperature. These phase transitions cause simultaneous changes in the electronic and structural properties. Therefore, we need to investigate the phonon properties of FeS in each phase and around these phase transitions from the condensed matter physical points of view.
In this research, we have applied the nuclear resonant inelastic x-ray scattering to extract the partial phonon DOS of FeS under pressure and then calculated the total phonon DOS. It is found that the phonon DOS of FeS is modified by the pressure-induced phase transitions.
We derive the pressure dependence of thermodynamic parameters from these phonon DOS. In these thermodynamic parameters, the pressure dependence of a force constant is determined by the Hund's rules of Fe^<2+> ion in FeS. A comparison of the observed and estimated compressibilities makes it clear that there is large pure electronic contribution in the observed compressibility in the metallic state. Consequently the larger observed compressibility in the metallic state is provided by a purely electronic contribution, which is estimated to be about 40% of the observed compressibility. Therefore, this discontinuous change of purely electronic contribution characterizes the phase transition at 3.5 GPa.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (12 results)

All 2005 2004 Other

All Journal Article (11 results) Publications (1 results)

  • [Journal Article] Structural and electrical properties of stoichiometric FeS compounds under high pressure at low temperature2005

    • Author(s)
      H.Kobayashi
    • Journal Title

      Phys.Rev.B 71

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Charge ordering in Eu_4As_3 under pressure2005

    • Author(s)
      H.Kobayashi
    • Journal Title

      J.Phys.: Condens.Matter. 17

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Phonon density of states on DyB_6 determined by ^<161>Dy nuclear resonant inelastic scattering2005

    • Author(s)
      H.Kobayashi
    • Journal Title

      Physica B 359-361

      Pages: 974-946

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Structural and electrical properties of stoichiometric FeS compounds under high pressure at low temperature2005

    • Author(s)
      H.Kobayashi et al.
    • Journal Title

      Phys.Rev.B 71

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Charge ordering in Eu_4As_3 under pressure2005

    • Author(s)
      H.Kobayashi et al.
    • Journal Title

      J.Phys.: Condens.Matter. 17

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Phonon density of states and compression behavior in iron sulfide under pressure2004

    • Author(s)
      H.Kobayashi
    • Journal Title

      Phys.Rev.Lett. 93

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Magnetism and de Haas-van Alphen effect in NiSb2004

    • Author(s)
      H.Kobayashi
    • Journal Title

      J.Magn.Magn.Mater. 272-276

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Charge ordering in Eu_4As_3 under pressure2004

    • Author(s)
      H.Kobayashi
    • Journal Title

      J.Phys. : Condens.Matter. 17

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Phonon density of states and compression behavior in iron sulfide under pressure2004

    • Author(s)
      H.Kobayashi et al.
    • Journal Title

      Phys.Rev.Lett. 93

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Magnetism and de Haas-van Alphen effect in NiSb2004

    • Author(s)
      H.Kobayashi et al.
    • Journal Title

      J.Magn.Magn.Mater. 272-276

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Phonon density of states on DyB_6 determined by ^<161>Dy nuclear resonant inelastic scattering

    • Author(s)
      H.Kobayashi et al.
    • Journal Title

      Physica B (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Publications] H.Kobayashi et al.: "Magnetism and deHaas-Van Alphen effect in NiSb"J.Mag.Mag.Mater. (印刷中).

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2020-05-15  

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