Gap suppression by self-injection of quasiparticles in tin—tin-oxide—tin tunnel junctions
1978; American Physical Society; Volume: 17; Issue: 11 Linguagem: Inglês
10.1103/physrevb.17.4303
ISSN1095-3795
Autores Tópico(s)Quantum and electron transport phenomena
ResumoA decrease of the superconducting energy gap has been observed in high-current-density tin---tin-oxide---tin tunnel junctions. This effect cannot be adequately accounted for by simple heating and is attributed to the presence of a nonequilibrium excess quasiparticle population created by the tunnel current. Analysis using a phenomenological model of the nonequilibrium superconductor yields a determination of the phonon-trapped quasiparticle recombination lifetime in tin in good agreement with the results of other experiments. A size-dependent enhancement of the phonon-emission efficiency of very narrow tunnel junctions is also observed and explained.
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