Impurity Effect on Superconductivity in Critical-Valence-Fluctuations Region
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概要
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Effects of non-magnetic impurities on the transition temperature of superconductivity in the critical-valence-fluctuations region are discussed. The impurity potential renormalized by the critical valence fluctuations is taken as a Yukawa type where the screening length is proportional to the square root of the valence susceptibility diverging toward the critical point of valence transition. The scatterings are considered as elastic and treated within the t-matrix approximation. The calculation to obtain the transition temperature of superconductivity is performed in parallel to the method for obtaining the Abrikosov--Gor'kov formula, but with a full account of wave-number dependence of the t-matrix in the intermediate states of pairing susceptibility. We find that the anisotropic (p-wave and d-wave) superconductivity becomes more robust against impurities with long range potential than those with short range potential to which the conventional Abrikosov--Gor'kov formula can be applied. In addition, we find that the Anderson theorem for s-wave superconductivity is broken down, i.e., the transition temperature is considerably suppressed by non-magnetic impurities with the long range potential. As a result, the reason why the maximum transition temperature of anisotropic superconductivity (with line nodes) attained by applying pressure almost coincides with a huge enhancement of the residual resistivity in CeCu2(Si,Ge)2 is explained. It is also understood that the substitution effect of Ce by La for CeCoIn5 is weak if CeCoIn5 is assumed to be located in the sharp valence crossover region of the Ce ion as suggested by a series of experimental observations.
- 2011-08-15
著者
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Miyake Kazumasa
Division Of Endocrine Surgery Kawasaki Medical School.
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Okada Akihisa
Division Of Material Physics Department Of Materials Engineering Science Graduate School Of Engineer
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Miyake Kazumasa
Division of Material Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Okada Akihisa
Division of Material Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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