Abstract
We have studied current-induced breakdown in type-I superconducting films at time resolutions of 100 nsec by combining a laser stroboscope with magneto-optical flux detection. We find that breakdown occurs through the regular, periodic generation of multiquanta flux tubes whose size is determined by properties intrinsic to the sample. Also, a measurement of flux-tube velocity as a function of penetration distance has been performed and compared with a recent theoretical model.
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