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1992 Fiscal Year Final Research Report Summary

Study of the Physical Properties of Narrow and Direct f band.

Research Project

Project/Area Number 03640290
Research Category

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

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

KASAYA Mitsuo  東北大学, 理学部, 助教授 (20004351)

Project Period (FY) 1991 – 1992
Keywords4f band / Kondo Insulator / Valence Fluctuation / CeRh_3B_2 / Ce_3Au_<3-x>Pt_xSb_4 / Crystalline field
Research Abstract

As a two-years(1991-1992) project, the research of title "Study of the Physical Properties of Narrow and Direct f band" started. In 1991, we built up apparatus of specific-heat measurement by using the light-pulse method and then prepared single crystal to perform the study planned in 1992. On the other hand, within these two years, study of so-called f electron system make great progress, and it is now believed that the terminology "Valence Fluctuation" which reminds of dynamical properties is not appropriate expression not only for metallic but also for insulating valence fluctuation compounds. In other words, ground state of valence fluctuating regime which has been believed to belong to phenomena in narrow and direct f-band and was a main theme in this project can be fairly well described by normal band calculation. Needless to say, our studies on YbB_<12> and Ce_3(Au_<1-x>Pt_x)_3Sb_4 contribute much to this conclusion. On the basis of these background, new aspect of a question tha … More t whether or not the anomalous ferromagnetic valence fluctuating compound CeRh_3B_2 and UIr_3B_2 can also be explained by the band calculation arises. The results of our research are as follows.
1) Valence fluctuating state of Ce_3(Au_<1-x>Pt_x)_3Sb_4... Pt substitution for Au decreases one electron, resulting in the shift of Ce valence from 3+ to 4+ and valence fluctuating state in Ce_3Pt_3Sb_4. In this process, semiconducting property persists. This implies that the energy gap arises from the band gap.
2) Transport of YbB_<12> under high pressure... We have measured pressure dependencies of the lattice parameter and energy gap. We have found that relative shift of lattice parameter at which energy gap becomes zero is the same in YbB_<12> and SmB_6.
3) Study of the giant crystalline field and ferromagnetism in CeRh_3B_2 via Soft-X-ray linear-dichroism.
4) Study of the magnetic property in Fe-doped UIr_3B_2... 5d band of Ir are polarized by Fe-moment and then ferromagnetism is appeared via f-d hybridization. Less

  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] KASAYA: "Crossover from magnetic to nonmagnetic ground state in the Kondo alloy system Ce(Ni_<1-x>Pd_x)Sn." J.Phys.Soc.Jpn.60. 2542-2545 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] NAKAMURA: "Electron-strain interaction in valence fluctuation compound SmB_6." J.Phys.Soc.Jpn.60. 4311-4318 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KASAYA: "Magnetic properties of the Dense Kondo compounds CePdSn and YbNiSn." J.Magn.Magn.Mat.104-1. 665-667 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KOHGI: "Neutron scattering studies of CeTSn(T=Ni,Pd)." J.Magn.Magn.Mat.108. 187-189 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] EBIHARA: "de Haas-van Alphen Effect in the Antiferromagnetic compound SmIn_3." J.Phys.Soc.Jpn.61. 2104-2108 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KASAYA: "Magnetic properties of New Ternary Rare Earth Compounds RPt(Pd)Sb." J.Phys.Soc.Jpn.61. 4187-4192 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] YAMAGUCHI: "Giant Crystal field and Ferromagnetism in the Kondo System CeRh_2B_2." Phys.Rev.B46. 9845-9848 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KASAYA: "On the origin of an Energy gap in Semiconducting Mixed-valent Rare-Earth Compoubds." J.Phys.Soc.Jpn.61. 3841-3844 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KASAYA: "Structural and Magnetic Properties of Ternary Rare Earth Compounds RPt(Au)Sb and RPd(Ni)Sn." Jpn.J.Appl.Phys.Series8. 223-229 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] HIGASHI: "The Crtstal Structure of CeTSn(T=Ni,Pd,Pt)" J.Alloys and Compounds. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] IGA: "Transport Properties under High Pressure of the Dense Kondo Compounds CePdSn and YbB_<12>." Physica. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KATOH: "Localized f-electron Antiferromagnetism,Heavy Fermion behavior and Mixed Valence in Ce_3Au_3Sb_4,Ce_3Pt_3Sb_4 and Related Compounds." Physica. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Kasaya et al: "Crossover from Magnetic to nonmagnetic ground state in the Kondo alloy system Ce(Ni_<1-x>Pd_x)Sn." J. Phys. Soc. Jpn.60. 2542-2545 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Nakamura et al: "Electron-Strain interaction in valence fluctuation compound SmB_6." J. Phys. Soc. Jpn.60. 4311-4318 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Kasaya et al: "Magnetic properties of the dense Kondo compounds CePdSn and YbNiSn." J. Magn. Magn. Mat.104-107. 665-667 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Kohgi et al: "Neutron scattering studies of CeTSn(T=Ni,Pd)" J. Magn. Magn. Mat.108. 187-189 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Ebihara et al: "de Haas-van Alphen Effect in the Antiferromagnetic compound SmIn_3." J. Phys. Soc. Jpn.61. 2104-2108 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Kasaya et al: "Magnetic properties of New ternary Rare Earth Compounds RPt(Pd)Sb." J. Phys. Soc. Jpn.61. 4187-4192 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Yamaguchi et al,: "Giant crystal field and Ferromagnetism in the Kondo system CeRh_3B_2." Phys. Rev.B46. 9845-9848 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Kasaya: "On the origin of an energy gap in semiconducting mixed-valent Rare-Earth Compounds." J. Phys. Soc. Jpn.61. 3841-3844 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Kasaya et al: "Structural and Magnetic Properties of Ternary Rare Earth Compounds RPt(Au)Sb and RPd(Ni)Sn." Jpn. J. Appl. Phys. Series. 8. 223-229 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I. Higashi et al: "The crystal structure of CeTSn(T=Ni,Pd and Pt)." J. Alloys Compounds. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] F. Iga et al: "Transport properties under High pressure of the dense Kindo Compounds CePdSn and YbB_<12>." Physica B. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Katoh et al: "Localized f-electron Antiferromagnetism, Heavy Fermion behavior and Mixed valence in Ce_3Au_3Sb_4, Ce_3Pt_3Sb_4 and related Compounds." Physica B. (1993)

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

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Published: 1994-03-24  

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