Dynamic and nonequilibrium amplification of the proximity effect in superconductors
V. P. SeminozhenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and T. G. Shevchenko State University, KievE.I. Khar'kovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and T. G. Shevchenko State University, KievS. E. ShafranyukPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov and T. G. Shevchenko State University, Kiev
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The effect of a high-frequency alternating voltage applied to the plates of a tunnel N/S sandwich (S is the superconductor, N is the normal metal or superconductor having the smaller gap) is examined. It is shown that for ΔN ≪T ≪ Δs(ΔN, ΔS, are the energy gaps in the electronic spectra of N and S films, respectively, and T is the temperature of the sandwich) the nonequilibrium effect of amplification of superconductivity in the N film can in many cases be comparable to and even exceed, the usual proximity effect. The corrections to the quantity ΔN, related to the effect of the alternating voltage on the virtual tunneling transitions of electrons, are found.
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