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Structural Instability and Magnetic Ordering in a Uranium-based Temary Compound

Research Project

Project/Area Number 07454084
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

FUJITA Toshizo  Hiroshima Univ., Dept.of Physics, Professor, 理学部, 教授 (20004369)

Co-Investigator(Kenkyū-buntansha) SUZUKI Takashi  Hiroshima Univ., Dept.of Physics, Associate Professor, 理学部, 助教授 (00192617)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥7,100,000 (Direct Cost: ¥7,100,000)
Keywordsuranium-based ternary compound / semiconductor-metal transition / magnetic transition / structural transition / complex transition / low-temperature X-ray diffraction in magnetic field / structural analysis / elastic moduli / 半導体一金属相転移
Research Abstract

The uranium-based ternary compound UNiSn undergoes a semiconductor-metal transition and an antiferromagnetic transition simultaneously at 43K.In addition, we have obtained a preliminary cvidence that the complex transition is accompanied by lattice deformation. In the present study, we investigated how these three instabilities affect each other. Our works are summarized as follows.
(1) An X-ray diffractometer was modified so that crystal structures are analyzed in magnetic field upto 8 tesla at low temperatures down to 3.5K.
(2) We measured specific heat, Mossbauer spectra, magnetic susceptibility, X-ray diffraction and elastic moduli of UNiSn around 43K.
(3) We found that applied magnetic field separates structural transition from antiferromagnetic transition.
(4) Partial substitution of Th for U separates the system into two phases with different Th concentration. The antiferromagnetic transition temperature decreases in both phases with increasing The concentration.
(5) The quadrupole ordering is responsible for the lattice deformation from a high-temperature cubic structure to a low-temperature orthorhombic one. This suggests the nature of the doublet ground state of f electrons in the uranium-based compounds.
The experiments were extended to other ternary compounds which contain uranium or cerium.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] T.Akazawa et al.: "Magnetic and Structural Instabilities in U_<1-x>Th_xNiSn" Physica B. 223&224. 218-221 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Maeda et al.: "Double Magnetic Transitions in Upt_2In" Physica B. 223&224. 228-230 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Akazawa et al.: "Anomalous Magnetic Transition in UNiSn" J.Phys.Soc.Jpn.65(11). 3661-3665 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Izawa et al.: "Different Electronic Ground States in the Hexagonal and Cubic Phases of UAu_2Sn" J.Phys.Soc.Jpn.65(10). 3260-3265 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Izawa et al.: "The Origin of Magnetic Field Dependence of Specific Heat in Single-Crystalline CeNiSn" J.Phys.Soc.Jpn.65(10). 3119-3122 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Suzuki et al.: "Huge Lattice Softening in CeRu_2 without Structural Transition" J.Phys.Soc.Jpn.65(9). 2753-2756 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Akazawa, T.Suzuki, S.Nishizaki, F.Nakamura, T.Fujita, Y.Maeda, T.Takabatake and H.Fujii: "Magnetic and Structural Instabilities in U_<1-x>Th_xNiSn" Physica. B223 & 224. 218-221 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Maeda, T.Takabatake, Y.Bando, H.Fujii, K.Oda, K.Sugiyama, K.Kido, K.Izawa, T.Suzuki, T.Fujita and Y.Morii: "Double Magnetic Transitions in UPt_2In" Physica. B223 & 224. 228-230 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Akazawa, T.Suzuki, F.Nakamura, T.Fujita, T.Takabatake and H.Fujii: "Anomalous Magnetic Transition in UNiSn" J.Phys.Soc.Jpn.65(11). 3661-3665 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Izawa, T.Suzuki, T.Fujita, Y.Maeda, T.Takabatake and H.Fujii: "Different Electronic Ground States in the Hexagonal and Cubic Phases of UAu_2Sn" J.Phy.Soc.Jpn.65(10). 3260-3265 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Izawa, T.Suzuki, M.Kitamura, T.Fujita, T.Takabatake, G.Nakamoto, H.Fujii and K.Maezawa: "The Origin of Magnetic Field Dependence of Specific Heat in Single-Crystalline CeNiSn" J.Phys.Soc.Jpn.65(10). 3119-3122 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Suzuki, H.Goshima, S.Sakita, T.Fujita, M.Hedo, Y.Inada, E.Yamamoto, Y.Haga and Y.Onuki: "Huge Lattice Softening in CeRu_2 without Structural Transition" J.Phys.Soc.Jpn.65(9). 2753-2756 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T. Akazawa et al.: "Magnetic and Structural Instabilities in U_<1-x>Th_xNiSn" Physica B. 223&224. 218-221 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y. Maeda et al.: "Double Magnetic Transitions in UPt_2In" Physica B. 223&224. 228-230 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T. Akazawa et al.: "Anomalous Magnetic Transition in UNiSn" J. Phys. Soc. Jpn.65 (11). 3661-3665 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] K. Izawa et al.: "Different Electronic Ground States in the Hexzgonal and Cubic Phases of UAu_2Sn" J. Phys. Soc. Jpn.65 (10). 3260-3265 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] K. Izawa et al.: "The Origin of Magnetic Field Dependence of Specific Heat in Single-Crystalline CeNiSn" J. Phys. Soc. Jpn.65 (10). 3119-3122 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T. Suzuki et al.: "Huge Lattice Softening in CeRu_2 without Structural Transition" J. Phys. Soc. Jpn.65 (9). 2753-2756 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T. Akazawa 他: "Magnetic and Structural Instabilities in U_<1-x>Th_xNiSn" Physica B. (印刷中). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2020-05-15  

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