Two-stage dissipation in a superconducting microbridge: Experiment and modeling

Details Two-stage dissipation in a superconducting microbridge: Experiment and modeling Two-stage dissipation in a superconducting microbridge: Experiment and modeling

2009-09-04

arxiv.org/abs/0909.0964v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

Using fluorescent microthermal imaging we have investigated the origin of "two-step" behavior in I-V curves for a current-carrying YBa_2Cu_3O_x superconducting bridge. High resolution temperature maps reveal that as the applied current increases the first step in the voltage corresponds to local dissipation (hot spot), whereas the second step is associated with onset of global dissipation throughout the entire bridge. A quantitative explanation of the experimental results is provided by a simple model for an inhomogeneous superconductor, assuming that the hot spot nucleates at a location with slightly depressed superconducting properties.

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