Josephson Effect in Unconventional-Superconductor/Ferromagnet/Unconventional-Superconductor Junctions.

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  • Tanaka Yukio
    Department of Applied Physics, Nagoya University, Nagoya 464–8603
  • Kashiwaya Satoshi
    CREST, Japan Science and Technology Corporation (JST) Electrotechnical Laboratory, Tsukuba, Ibaraki 305–8568

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To reveal the influence of the exchange interaction on the Josephson effect, the dc 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 in 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 realized with the increment of the exchange interaction due to the break down of SU(2) symmetry in the spin space.

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