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Interference Phenomena and Long-Range Proximity Effect in Clean Superconductor-Ferromagnet Systems
We study peculiarities of the proximity effect in clean superconductor-ferromagnet structures caused by either the spatial or momentum dependence of the exchange field. Even a small modulation of the exchange field along the quasiparticle trajectories is shown to provide a long-range contribution to the supercurrent due to the specific interference …