Voltage Measurements within the Nonequilibrium Region near Phase-Slip Centers

We have used complementary sets of normal and superconducting probes to study the nonequilibrium region near phase-slip centers in narrow superconducting strips. An exponentially decaying branch imbalance potential, ${\ensuremath{\mu}}_{Q}$, is observed and the decay length, the quasiparticle diffusion length, is measured directly and compared to the phase-slip resistance.

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