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By now it is known that in a singlet superconductor/ferromagnet (S/F)structure the superconducting correlations carried by opposite-spin pairspenetrate into the ferromagnet over a short distance of the order of magneticcoherence length. The long-range proximity effect (LRPE), taking place on thelength scale of the normal metal coherence length, can only be maintained byequal-spin pairs, which can be generated by magnetic inhomogeneities in thesystem. In this work we have predicted a new type of LRPE, which can take placein S/F heterostructures under non-equilibrium conditions. The superconductingcorrelations in the F region are generated by opposite-spin Cooper pairs andequal-spin pairs are not involved. The possibility for an opposite-spin pair topenetrate into the ferromagnet over a large distance is provided by creation ofthe proper non-equilibrium quasiparticle distribution there. This leads to asharp increase (up to a few orders of magnitude) of the critical Josephsoncurrent through a S/F/S junction at some values of the voltage controlling thenonequilibrium distribution in the F interlayer.

Long-range proximity effect for opposite-spin pairs in S/F heterostructures under non-equilibrium quasiparticle distribution