Abstract
The magnetic impurity effect on the Josephson current through mesoscopic tunnel junctions is investigated by numerically solving the Bogoliubov-de Gennes equations self-consistently. It is found that the presence of magnetic impurities in the middle layers significantly affects the current flowing across the junctions with d-wave superconductors. A 0 or π state for the current-phase relation with a period of 2π can be realized when the thickness of middle magnetic impurity layers is varied. Moreover, the 0–π or π–0 transitions are demonstrated with increasing the temperature for Josephson junctions with specific interlayer thicknesses.
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