Nonequilibrium properties of ultrashort superconducting microbridges

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Abstract
Superconducting microbridges with lenghts ranging from shorter than to longer than the coherence length have been fabricated. Those microbridges whose length is longer than the coherence length do show a dynamic enhanced critical current in accordance with the theory of Schmid, Schön, and Tinkham. Those microbridges whose length is shorter than the coherence length do not exhibit a dynamically enhanced critical current and a possible reason for its absence is that the order parameter is depressed in the banks adjacent to the microbridge.