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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
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1992: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1991: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsEnergy Gap / Kondo Lattice / Cerium Compound / Heavy Fermion / Valence Fluctuation / Hybridization / Single Crystal / Magnetism / エネルギ-ギャップ / スピン相関 / 中性子散乱 / 磁気秩序
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.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [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
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Takabatake: "Anisotropic Suppression of the Energy Gap in CeNiSn by High Magnetic Fields" Phys.Rev.B45. 5740-5743 (1992)

    • Related Report
      1992 Annual Research Report
  • [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)

    • Related Report
      1992 Annual Research Report
  • [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)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Suzuki: "Elastic Anomalies of Valence Fluctuating CeNiSn" J.Magn. Magn. Mater.104-107. 1293-1294 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] A.Krazer: "A μ SR Study of Magnetic Correlations in CeNiSn" Europhys.Lett.19. 649-654 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Takabatake: "Coherence Gap Formation in the Kondo-Lattice Compound CeNiSn" Japan.J. Appl. Phys.Ser.8. 254-266 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Takabatake: "Anisotropic suppression of the energy gap in CeNiSn by high magnetic fields" Phys.Rev.B. 45. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Kyogaku: "Magnetic instability of the gap state in CeNiSn at very low temperature" J.Phys.Soc.Japan. 61. 43-46 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Takabatake: "Magnetoresistance and Hall effect in the Kondoーlattice system CeNiSn with an anisotropic energy gap" J.Magn.& Magn.Mater.(1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Suzuki: "Elastic anomalies of valence fluctuating CeNiSn" J.Magn.& Magn.Mater. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Takabatake: "Fieldーinduced transition from a pseudogap state to a heavyfermion state in the Kondoーlattice system CeNiSn" Physica B. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Y.Uwatoko: "Effect of pressure on the thermal expansion coefficient in CeNiSn" J.Magn.& Magn.Mater.(1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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