Der Einfluss der Metallbedeckung auf die Supraleitenden Eigenschaften von Dünnen Zylindern

The critical parameters (upper critical field, critical temperature) of a thin type II superconducting cylinders are considerably changed by coating with normal metal. Below a minimum cylinder radius, the superconductivity can no longer exist. The oscillations of the critical temperature with magnetic field are also modified. For good conductive metals, only an aperiodic effect appears. The decrease of the critical temperature produced by coating is given. The thin-film quantization effects the existence of jumps in the field dependence of the critical temperature.