Current-voltage characteristics of quasi-one-dimensional superconductors: An S-curve in the constant voltage regime

Abstract

Applying a constant voltage to superconducting nanowires we find that its IV-characteristic exhibits an unusual S-behavior. This behavior is the direct consequence of the dynamics of the superconducting condensate and of the existence of two different critical currents: j_{c2} at which the pure superconducting state becomes unstable and j_{c1}<j_{c2} at which the phase slip state is realized in the system.

4 pages, 5 figures, replaced with minor changes

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