Effect of Magnetic Impurity Correlations on Josephson Tunneling
Abstract
The ordering trend of magnetic impurities at low temperature results in the frustration of the pair-breaking effect and induces a ``recovery'' of superconducting properties. We show that this effect manifests itself in the deviation of the Josephson current amplitude from the values obtained within the Ambegaokar-Baratoff and the Abrikosov-Gor'kov models. We consider both weak and strong-coupling cases. The theory is applied to describe the experimental data obtained for the low-Tc superconductor SmRh4B4. We further predict a ``recovery'' effect of the Josephson current in high-temperature superconductors.
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