Critical valence fluctuations and unconventional superconductivity
Kazumasa Miyake
Division of Materials Physics, Department of Materials Engineering Science, Osaka University, Toyonaka,
Osaka 560-8531, Japan
I present a new idea of critical-valence-fluctuation (CVF) mechanism for CeCu2 (Ge,Si)2 . 1 In particular,
it is argued that the CVF mechanism is not specific to Ce112 compounds but can also apply to Ce115
compounds, such as CeCoIn5 , CeRhIn5 , and CeIrIn5 . These discussions might suggest that the CVF
mechanism offers us a new paradigm for unconventional superconducitivity other than the spin fluctuation
mechanism.
1
Y. Onishi and K. Miyake, J. Phys. Soc. Jpn. 69, 3955 (2000); A. T. Holmes, D. Jaccard, and K.
Miyake, Phys. Rev. B 69, 024508-1 (2004).
Sorting category: Bb Superconductivity
Keywords: critical valence fluctuations, unconventional superconductivity, CeCu 2 (Ge,Si)2 , Ce115
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