Abstract
Nonequilibrium phenomena in the two electrodes of high-current-density superconducting tunnel junctions are analyzed. The quasiparticle injection-induced enhancement of the energy gaps as well as of the critical current of one of the electrodes are considered. A graphic approach is employed to solve the coupled gap equations for both films. Multiple-gap states are found at voltages close to the sum and difference of the two gaps. If a large transport current is passed through one of the electrodes, multiple stable solutions of the gap equations occur at most bias voltages. Because each solution has its own critical current level, the nonequilibrium critical current is no longer a simple single-valued quantity.
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