Thermally Induced Flux Motion in Superconducting Tin

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Abstract
Direct evidence is presented for thermally induced flux motion in a superconductor. The method consists of setting up the macroscopic Landau domain structure in a thin single crystal of tin and imposing a temperature gradient along the sample. Motion is monitored with the Sharvin point-contact technique, enabling one to deduce an experimental value for the actual velocity of flux motion. The dependence of this velocity on the applied temperature gradient is found to be in fair agreement with a theory due to Clem.