Theory of the Josephson effect in superconductor / ferromagnet / superconductor junctions

Details Theory of the Josephson effect in superconductor / ferromagnet / superconductor junctions Theory of the Josephson effect in superconductor / ferromagnet / superconductor junctions

1999-03-02

arxiv.org/abs/cond-mat/9903034v3

Physics

Condensed Matter

Superconductivity

8 pages and 4 figures (Mistakes in uploading process are corrected on March 9, 1999)

Scientific paper

To reveal the influence of the exchange interaction on the Josephson effect, the d.c. Josephson current in unconventional-superconductor / ferromagnet / unconventional-superconductor junctions is studied. When the two superconductors have d-wave symmetry, the Josephson current is drastically suppressed with the increase of the exchange interaction. On the other hand, when the two superconductors have different parities, e.g. s-wave and p-wave, an enhancement of the Josephson current is obtained with the increment of the exchange interaction due to the break-down of SU(2) symmetry in the spin space.

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