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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<sub><b> 2</b></sub>Ge<sub><b> 2</b></sub> and Related Compounds

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, no. 12.0 (2013): 3955.0-3964.0

Cited: 53|Views23

Abstract

Properties of an extended periodic Anderson model with the f-c Coulomb interaction U-fc is studied as a model for CeCu2Ge2 and related compounds which is considered 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 tha...More

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