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1994 Fiscal Year Final Research Report Summary

Magnetic Phase Transitions fo Rare Earth Compounds Studied by the de Haas-van Alphen Effect

Research Project

Project/Area Number 04452034
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionOsaka University (1994)
University of Tsukuba (1992-1993)

Principal Investigator

YOSHICHIKA Onuki  Osaka University Fac.of Sci.Dep.of Phys., Prof., 理学部, 教授 (40118659)

Co-Investigator(Kenkyū-buntansha) SETTAI Rikio  Osaka University Fac.of Sci.Dep.of Phy., Res.Asoci., 理学部, 助手 (00251041)
SUGIYAMA Kiyohiro  Osaka University Fac.of Sci.Dep.of Phy., Res.Asoci., 理学部, 助手 (00187676)
Project Period (FY) 1992 – 1994
Keywordsde Haas van Alphen effect / magnetic transiton / Fermi surface / cyclotron mass / rare earth compound / Heavy fermion
Research Abstract

The de Haas-van Alphen (dHvA) effect is the most useful method to determine the Fermi surface, cyclotron mass and scattering lifetime of the conduction electron. We have grown high-purity single crystals and studied the magnetic phase transitions of the rare earth compound by the dhvA method. We have found three kinds of phase transitions. Experimental results are as follow ;
(1) Metamagnetic transition in the antiferromagnetic compound
We have studied the dhvA effect of the antiferromagnetic compound NdIn_3. The Fermi surface in the antiferromagnetic state is found to be constructed by the band folding procedure of the Fermi surface of LaIn_3 into the small Brillouin zone based on the large magnetic unit cell.
(2) Metamagnetic transition based on the quadrupole moment in PrCu_2
We have found a new type of metamagnetic transition in PrCu_2 when the field is directed along the c-axis of the orthorhombic structure. Here, PrCu_2 is not an antiferromagnetic compound but a Van-Vlec para-magnetic compound with the singlet ground state of the 4f level. This transition brings about the switching of the easy (a-axis) and hard (c-axis) axs in magnetization.
Change of the 4f electron nature from itinerant to localized in CeRu_2Si_2
The metamagnetic behavior is found at 8T in CeRu_2Si_2 when the field is directed along the [001] direction in the tetragonal structure. We have studied in detail the dHvA experiments in fields up to 19T and at temperatures down to 20mK and clarified the Fermi surface. the 4f-electron is found to be changed in nature from itinerant to localized.

  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] 大貫惇睦: "希土類・ウラン化合物の純良単結晶育成" 固体物理. 29. 805-810 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大貫惇睦 他: "ウラン化合物の純良単結晶育成" 固体物理. 29. 486-489 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Onuki: "Change of the Fermi Surface at the Metamagnetic Transition in CeRu_2Si_2" Physica B. 199&200. 665 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Settai 他: "Change of the Fermi Surface at the Metamagnetic Transition in NdIn_3" Physica B. 201. 102-106 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.W.Yun 他: "Magnetic and Electrical Properties of UPd_3" J.Phys.Soc.Jpn.63. 1518-1529 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sugawara 他: "Single Crystal Growth and Electrical Properties of CeRh_2 and CeIr_2" J.Phys.Soc.Jpn.63. 1502-1507 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大貫惇睦: "重い電子系(物理学論文選集 IV)" 日本物理学会, 166 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Onuki: "Heavy Electrons in the Ce and U Compounds" World Scientific(Proc.5th Asia-Pacific Phys.Conf.), 12 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Onuki: "The method to grow high-purity single crystals of rare earth and uranium compounds" Solid States Physics. 29. 805-810 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Onuki: "The method to grow high-purity single crystals of uranium compounds" Solid States Physics. 29. 486-489 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Onuki: "Change of the Fermi Surface at the Metamagnetic Transition in CeRu_2Si_2" Physica B. 199&200. 665- (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Settai et.al.: "Change of the Fermi Surface at the Metamagnetic Transition in NdIn_3" Physica B. 201. 102-106 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.W.Yun et.al.: "Magnetic and Electrical Properties of UPd_3" J.Phys.Soc.Jpn.63. 1518-1529 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Sugawara et.al.: "Single Crystal Growth and Electrical Properties of CeRh_2 and CeIr_2" J.Phys.Soc.Jpn.63. 1502-1507 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Settai et.al.: "Metamagnetic Transition in PrCu_2 Studied by the de Haas-van Alphen Effect" J.Phys.Soc.Jpn.64. 383-386 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Onuki: Hevy Electron System. the Physical Society of Japoan, Selected Papers in Physics IV, 166 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Onuki: Hevy Electron in the Ce and U compounds. World Scientific Proc.5th Asia-Pacific Phys.Conf., 12 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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