Enhanced Valence Fluctuations Caused by f-c Coulomb Interaction in Ce-Based Heavy Electrons: Possible Origin of Pressure-Induced Enhancement of Superconducting Transition Temperature in CeCu_2Ge_2 and Related Compounds : Condensed Matter: Electronic Prope

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概要

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• Properties of an extended periodic Anderson model with the f-c Coulomb interaction U_<fc> is studied as a model for CeCu_2Ge_2 and related compounds which is cosidered to exhibit a sharp valence change under pressure. The problem is treated by extending the slave-boson and large-N expansion method to treat the present system. It is shown that, as the f-level ε_f is increased relative to the Fermi level, the sharp valence change is caused by the effect of U_<fc> with moderate strength of the order of the bandwith of conduction electrons. The superconducting transition temperature T_c due to the valence-fluctuation exchange is estimated on the slave-boson fluctuation approximation. In the model with spherical Fermi surface, T_c exhibits sharp peak as a function of ε_f, simulating the effect of pressure, for the d-wave pairing channel.

• 社団法人日本物理学会の論文
• 2000-12-15

著者

• Miyake Kazumasa

  Division Of Endocrine Surgery Kawasaki Medical School.

• Onishi Yoshifumi

  Division Of Materials Physics Department Of Physical Science Graduate School Of Engineering Science

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