CURRENT-INDUCED RESISTIVE STATES IN SUPERCONDUCTING FILMS

We present an experimental study of the current induced destruction of superconductivity in cylindrical indium films. The most interesting a spect of these experiments is the possibility to observe and investiga te different mechanisms of the superconductivity destruction depending on the ratio of the sample thickness d to the coherence length xi(T). If d/xi(T)<4.5 we observe, above a critical current value, a resistiv e state throughout the section of the film, but in the case of d/xi(T) >4.5 the destruction of superconductivity starts, as in bulk samples, with the formation of a normal shell along the outer surface of the cy lindrical sample together with a thin layer of the two-dimensional mix ed state at the inner surface.