In general, the quasiparticles, phonons, and pair field in a superconductor driven by an external source are out of equilibrium. Here we review briefly the various quasiparticle and phonon lifetimes in real metals and estimate the strengths necessary to induce a strongly nonequilibrium state. Then we investigate the properties of a thin film driven in a spatially uniform steady state by quasiparticle injection, heater phonon pumping, and microwave radiation. This analysis uses a set of coupled kinetic equations for quasiparticle and phonon distributions and the BCS gap equation with the self-consistently determined quasiparticle distribution. Such films can be used to generate phonons with energy near 2 δ. In addition, the gap enhancement in a thin film due to microwave irradiation is discussed.
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Work supported by the Office of Naval Research. Preliminary results have been reported at the Applied Superconductivity Conference, Stanford, August 1976 [IEEE Trans. Magn. MAG-13, 747 (1977)] and at the NATO Advanced Study Institute at Lago di Garda, Italy, September 1976 [NATO Adv. Study Inst. Series (B-Physics) 21, 447–486 (1977)].
J. S. Guggenheim Foundation Fellow (1976–77).
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Chang, JJ., Scalapino, D.J. Nonequilibrium superconductivity. J Low Temp Phys 31, 1–32 (1978). https://doi.org/10.1007/BF00116228
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DOI: https://doi.org/10.1007/BF00116228