Abstract
We have studied the diffusive current of quasiparticles in long superconducting tin microbridges in two different experiments. In the first experiment, the influence of quasiparticle current generated by one phase-slip center upon the appearance of other phase-slip centers in the same microbridge is examined. In the second experiment, the spatial dependence of the chemical potential of the quasiparticles generated in a single phase-slip center is measured directly. The results of these experiments demonstrate conclusively the exponential decay of both the quasiparticle current and potential from the center of the phase-slip center, and the measured values of the characteristic diffusion length agree well with theoretical predictions, both in magnitude and temperature dependence.
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