Effect of Nonequilibrium Phonons on Superconducting States with Two Coexisting Energy Gaps

摘要

It is shown that under the influence of tunnel currents, superconductors may exhibit a first order transition to a state with two coexisting energy gaps. An energy and number conserving approximation for the collision operator is used to explicitly take into account in the theory the effect of nonequilibrium phonons. Quantitative predictions for experiments are presented. (Author)