Effect of Transition Metal Impurities on Superconductivity

概要

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The existing experimental results on the effect of transition metal impurities on superconductivity in several alloy systems were compared with theories based on two different models, the Anderson model and the s-d model. It was found that the theory of Müller-Hartmann and Zittartz (s-d model) reproduces the experimental results in Kondo alloys with $T_{\text{K}}/T_{\text{co}}{\lesssim}1$ fairly well if $T_{\text{K}}$ of the theory is replaced by $T_{\text{K}}/10$, where $T_{\text{K}}$ is the Kondo temperature of alloy and $T_{\text{co}}$ is the critical temperature of host metal. It was also found that the thermodynamic quantities at $T{=}0$ of Kondo alloys fit the theory of Shiba (Anderson model) remarkably well. From the observed variation of the position of the localized excited states with in the gap with $T_{\text{K}}/T_{\text{co}}$, it was inferred that the transition from the pair breaking behavior to the nonmagnetic BCS behavior takes place rather abruptly at about $T_{\text{K}}/T_{\text{co}}{\approx}80$.
社団法人日本物理学会の論文
1975-03-15