Long-Range Superharmonic Josephson Current
Luka Trifunovic
DOI 10.1103/PhysRevLett.107.047001 · Physical Review Letters
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Abstract
We consider a long superconductor-ferromagnet-superconductor junction with one spin-active region. It is shown that an odd number of Cooper pairs cannot have a long-range propagation when there is only one spin-active region. When the temperature is much lower than the Thouless energy, the coherent transport of two Cooper pairs becomes the dominant process and the superharmonic current-phase relation is obtained (I∝sin2ϕ).
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