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VOLUME 49 (1989) | ISSUE 10 | PAGE 570
Resonant Josephson current through Kondo impurities in a tunnel barrier
The Josephson current in a junction containing resonant impurity levels in the tunnel barrier is calculated. Depending on the relation between the superconducting transition temperature and the width of these levels, the Coulomb repulsion of electrons at impurities will either suppress the Josephson current or stimulate it, by virtue of the Kondo effect.