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1992 Fiscal Year Final Research Report Summary

Energy Gap Formation in the Kondo-Lattice Compounds

Research Project

Project/Area Number 03640315
Research Category

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

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

Principal Investigator

TAKABATAKE Toshiro  Fac.Integr.Arts & Sci.Assoc.Prof., 総合科学部, 助教授 (40171540)

Co-Investigator(Kenkyū-buntansha) EKINO T  Fac.Integr.Arts & Sci.Res.Assoc., 総合科学部, 助手 (40185103)
FUJII H  Fac.Integr.Arts & Sci.Prof., 総合科学部, 教授 (30034573)
Project Period (FY) 1991 – 1992
KeywordsEnergy Gap / Kondo Lattice / Cerium Compound / Heavy Fermion / Valence Fluctuation / Hybridization / Single Crystal / Magnetism
Research Abstract

The results of transport, thermal and magnetic measurements of CeNiSn characterize this compound as a rare example located near the crossover between the Kondo and VF regimes. The highly anisotropic behavior reflects the strong hybridization of the 4f states with the Sn-5p and Ni-3d states in the orthorhombic structure. The Kondo temperature of this system is about 28 K.At low temperatures below 12K,coherence of local spin fluctuations develops, as indicated by the peaking in both Pa(T) and Xa(T) at 12 K and in RH(T) at 9K.
An anisotropic gap opens in the heavy-quasiparticle bands as temperature is reduced below 6 K. This semiconducting state with a charge excitation gap of several Kelvins is destructible by applying either hydrostatic pressure of 20 kbar or magnetic field of 13 T along the easy a axis.
Substitutions of Co and Pt for a few percent of Ni in CeNiSn destroy the energy gap and shift the system toward the VF and the heavy-fermion regimes, respectively.
The combined results indicate that the gap formation in CeNiSn is very sensitive to the degree of hybridization of the 4f and the conduction electron states. It is also emphasized that the development of coherence in the Kondo lattice is crucial for the gap formation.

  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] T.TAKABATAKE: "Anisotropic Suppression of the Energy Gap in CeNiSn by High Magnetic Fields" Phys.Rev.B45. 5740-5743 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.TAKABATAKE: "Field-Induced Transition from a Pseudogap State to a Heavy-Fermion State in the Kondo-Lattice System CeNiSn" Physica B. 177. 177-180 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.TAKABATAKE: "Magnetoresistance and Hall Effect in the Kondo-Lattice CeNiSn with an Anisotropic Energy Gap" J.Magn.Mag.Mater.108. 155-156 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.SUZUKI: "Elastic Anomalies of Valence Fluctuating CeNiSn" J.Magn.Magn.Mater.104-107. 1293-1294 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Krazer: "A μ SR Study of Magnetic Correlations in CeNiSn" Europhys.Lett.19. 649-654 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.TAKABATAKE: "Coherence Gap Formation in the Kondo-Lattice Compound CeNiSn" Japan.J.Appl.Phys.Ser.8. 254-266 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Field-Induced Transition from a Pseudogaph State to a Heavy-Fermion State in the Kondo-Lattice System CeNiSn: "T.Takabatake, M. Nagasawa, H. Fujii, G. Kodo, K. Sugiyama, K. Senda, K. Kido and M. Date" Physica B. 177. 177-180 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Effect of Pressure on the Thermal Expansion Coefficient in CeNiSn: "Y. Uwatoko, G. Oomi, T. Takabatake and H. Fujii" J. Magn. Magn. Mater. 104-107. 643-644 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Magnetoresistance and Hall Effect in the Kondo-Lattice System CeNiSn with an Anisotropic Energy Gap: "T. Takabatake, M. Nagasawa, H. Fujii, M. Nohara, T. Fujita, G. Kido and T. Hiraoka" J. Magn. Magn. Mater. 108. 155-156 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Magnetic Instability of the Gap State in CeNiSn at Very Low Temperature: "M. Kyogaku, Y. Kitaoka, K. Asayama, T. Takabatake and H. Fujii" J. Phys. Soc. Jpn.61(1). 43-46 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Anisotropic Suppression of the Energy Gap in CeNiSn by High Magnetic Fields: "T. Takabatake, M. Nagasawa, H. Fujii G. Kido M. Nohara, S. Nishigori, T. Suzuki and T. Fujita" Phys. Rev.B45(10). 5740-5743 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Anisotropic Hybridization in Some Cerium and Uranium Compounds with Hexagonal ZrNiAl-Type Structure: "H. Fujii, T. Takabatake and Y. Andoh" J. Alloys & Compounds. 181. 111-121 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Unusual Low-Temperature Properties of Ce Compounds: "T. Fujita, T. Suzuki, S. Nishigori, T. Takabatake, H. Fujii and J. Sakurai" J. Magn. Magn. Mater.108. 35-39 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Elastic Anomalies of Valence Fluctuating CeNiSn: "T. Suzuki, M. Nohara, S. Fujisawa, H. Fujisaki, T. Fujita, M. Nagasawa, T. Takabatake and H. Fujii" J. Magn. Magn. Mater.104-107. 1293-94 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A エシSR Study of Magnetic Correlations in CeNiSn: "A. Krazer, G.M. Kalvius. T. Takabatake, G. Nakamoto, H. Fujii and S.R. Kreitzman" Europhys, Lett.19(7). 649-654 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Anisotropic Effects in the Antiferromagnetic Kondo Compounds CePtSn: "T. Takabatake, H. Iwasaki, G. Nakamoto, H. Fujii, H. Nakotte, F.R. de Boer and V. Sechovsky" Physica B. 183. 108-114 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Coherence Gap Formation in the Kondo-Lattice Compound CeNiSn: "T. Takabatake and H. Fujii" Jpn. J. Appl. Phys.Ser. 8.254-266 (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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