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1997 Fiscal Year Final Research Report Summary

Coherence and Spin correlations in Kondo Semiconductors

Research Project

Project/Area Number 08044091
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

TAKABATAKE Toshiro  HIROSHIMA UNIVERSITY Fac.Science, Professor, 理学部, 教授 (40171540)

Co-Investigator(Kenkyū-buntansha) KALVIUS Geor  ミュンヘン工科大学, 物理学科, 教授
REGNAULT Lou  グルノーブル原子力研究所, 主任研究員
KADOWAKI Hiroaki  Fac.Sci.Tokyo Metr.Univ., Assoc.Prof., 理学部, 助教授 (70194876)
UMENO Kazunori  HIROSHIMA UNIVERSITY Fac.Science, Reser.Assoc., 理学部, 助手 (10223596)
IGA Fumitoshi  HIROSHIMA UNIVERSITY Fac.Science, Assoc.Prof., 理学部, 助教授 (60192473)
REGNAULT Louis-Pierre  CEA,DRF,Grenobole, Group leader
KALVIUS Georg Michael  Phys.Dep.T.U.Munchen, Prof.
Project Period (FY) 1996 – 1997
KeywordsKondo semiconductor / Neutron scattering / Muon spin relaxation / Spin density wave / Spin gap / Non-Fermi liquid behavior
Research Abstract

The coherence and spin correlations in Kondo semiconductors have been studied by neutron scattering, muSR and low-temperature magnetic measurements on single crystals of CeNiSn, Ce7Ni3 and YbB12 grown at Hiroshima University.
1.Neutron scattering study
(1) The spin excitaion in CeNiSn was studied in magnetic fields up to 12 T.The field dependence of the peak at an energy of 4 meV traces that of the specific heat. This quasi-one dimensional correlation is found to be essential for gap formation in CeNiSn.
(2) The inelastic scattering from Ce7Ni3 near the critical pressure of 4 kbar can be described by a universal function of omega/T.
(3) The intensity of spin excitaion of YbB12 at 14 meV shows strong q dependence with a sharp maximum at (111).
2.Muon spin relaxation study
(I) CeNil-xCuxSn exhibits a nonmagnetic-magnetic transition near x=0.06.
(2) The muSR results on Ce7Ni3 indicates the first-order SDW transition at 1.8K and second-order transition at 0.7K.The direction of the magnetic moment of Ce ions tilts from the c axis.
3.Low-temperature study of quantum critical behavior
(I) Both the specific heat divided by temperature and magnetic susceptibility of CeNi0.95Cu0.05Sn continue to increase down to 0.025K.
(2) Non-Fermi liquid behavior in the specific heat of Ce7Ni3 observed above 0.5K under a pressure of 0.4 GPa is found to be a crossover to the Fermi liquid behavior below 0.2K.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] T.Takabatake: "Ce-and Yb-based Kondo semiconductors" J.Magnetism and Mag:Mater.177-181(印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] F.Iga: "Single crystal growth and physical properties of YbB12" J.Magnetism and Mag.Mater.177-181(印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Raymond: "An inelastic neutron scattering study of the Kondo semiconductor CeNiSn in high magnetic field" J.Phys.Cond.Matter. 9. 1599-1608 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Bruckl: "Disorder-induced heavy fermion behavior in CeNi1-xCuxSn" Physica B. 240. 199-204 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Kratzer: "μSR magnetic response of CeNiSn on impurity content" Physica B. 230-232. 661-663 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.M.Kalvius: "The influence of impurities and alloying in the Kondo semimetal CeNiSn as seen by μSR" Hyperfine Interactions. 104. 157-164 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.M.Luke: "Spin fluctuations and magnetic order in the heavy fermion compound CePt2Sn2" Hyperfine Interactions. 104. 199-203 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kadowaki: "Pressure effect on magnetic excitation in the Kondo Semimetal CeNiSn" Physica B. 230-232. 664-666 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Takabatake.: "Ce-and Yb-based Kondo semiconductors" J.Magn.Magn.Mater.(in press.). 177-181 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] F.Iga: "Single crystal growth and physical properties of YbB12" J.Magn.Magn.Mater.(in press.). 177-181 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Raymond: "An inelastic neutron scattering study of the Kondo semiconductor CeNiSn in high magnetic field" J.Phys.Cond.Matter.9. 1599-1608 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Bruckl: "Disorder-induced heavy fermion behavior in CeNi1-xCuxSn" Physica B. 240. 199-204 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Kratzer: "muSR magnetic response of CeNiSn on impurity content" Physica B. 230-232. 661-663 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.M.Kalvius: "The influences of impurities and alloying in the Kondo semimetal CeNiSn as seen by muSR" Hyperfine Intereractions. 104. 157-164 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.M.Lnke: "Spin fluctuation and magnetic order in the heavy fermion compound CePt2Sn2" Hyperfine Intereractions. 104. 199-203 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kadowaki: "Pressure effect on magnetic excitation in the Kondo semimetal CeNiSn" Physica B. 230-232. 664-666 (1997)

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

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Published: 1999-03-16  

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