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

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

References in corpus (1)

• Properties of Magnetic Impurity in a Metal

Cited by in corpus (1)

• Strong magnetic pair breaking in Mn substituted MgB_2 single crystals