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1996 Fiscal Year Final Research Report Summary

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
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
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.

  • Research Products

    (12 results)

All Other

All Publications (12 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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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
  • [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

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Published: 1999-03-09  

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