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 SmRh 4B 4. We further predict a `recovery' effect of the Josephson current in high-temperature superconductors.
- Publication:
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Physica C Superconductivity
- Pub Date:
- April 1998
- DOI:
- 10.1016/S0921-4534(97)01813-3
- arXiv:
- arXiv:cond-mat/9801189
- Bibcode:
- 1998PhyC..298..231B
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- 7 pages, 4 figures. Accepted for publication in Physica C