Limiting Flux-Passage Time in Narrow Superconductors

A limiting value for the supercurrent response of narrow superconductors upon flux passage has been deduced from measurements of the 9.2-GHz impedance of thin cylindrical films. The observed times are in good agreement with the predicted relation ${\tau }_1\simeq \frac{\hslash }{2\Delta \mathrm{}\left(T\right)\mathrm{}}$, where $2\Delta \mathrm{}\left(T\right)\mathrm{}$ is the BCS energy gap for the material.