Valence Instability and Superconductivity in Heavy Fermion Systems(<SPECIAL TOPICS>Frontiers of Novel Superconductivity in Heavy Fermion Compounds)
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概要
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Many cerium-based heavy fermion (HF) compounds have pressure-temperature phase diagrams in which a superconducting region extends far from a magnetic quantum critical point. In at least two compounds, CeCu_2Si_2 and CeCu_2Ge_2, an enhancement of the superconducting transition temperature was found to coincide with an abrupt valence change, with strong circumstantial evidence for pairing mediated by critical valence, or charge transfer, fluctuations. This pairing mechanism, and the valence instability, is a consequence of a f-c Coulomb repulsion term U_<fc> in the Hamiltonian. While some non-superconducting Ce compounds show a clear first order valence instability, analogous to the Ce α-γ transition, we argue that a weakly first order valence transition may be a general feature of Ce-based HF systems, and both magnetic and critical valence fluctuations may be responsible for the superconductivity in these systems.
- 2007-05-15
著者
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MIYAKE KAZUMASA
Department of Internal Medicine, Division of Gastroenterology, Nippon Medical School
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Miyake Kazumasa
Department Of Internal Medicine Division Of Gastroenterology Nippon Medical School
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Miyake Kazumasa
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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Jaccard Didier
Departement De Physique De La Matiere Condensee Section De Physique University Of Geneva
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HOLMES Alexander
KYOKUGEN, Center for Quantum Science and Technology under Extreme Conditions, Osaka University
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Holmes Alexander
Kyokugen Center For Quantum Science And Technology Under Extreme Conditions Osaka University
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