Effect of Magnetic Impurity Correlations on Josephson Tunneling

Details Effect of Magnetic Impurity Correlations on Josephson Tunneling Effect of Magnetic Impurity Correlations on Josephson Tunneling

1998-01-19

arxiv.org/abs/cond-mat/9801189v1

Physics

Condensed Matter

Superconductivity

7 pages, 4 figures. Accepted for publication in Physica C

Scientific paper

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-$T_c$ superconductor SmRh$_4$B$_4$. We further predict a ``recovery'' effect of the Josephson current in high-temperature superconductors.

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