Influence of Thermal Effects on the Kinetics of the Destruction of Superconductivity by a Current
The kinetics of the isothermal destruction of type I superconductivity by a current were studied theoretically by Pippardl and in a more detailed way by Rothen and Bestgen.2 Previously reported experiments,3 based on the measurement of the voltage along the sample, show fairly good agreement with this theory if the applied current J is sufficiently larger than the critical J c (T 0) (given by Silsbee’s hypothesis), where T 0 is the helium bath temperature. Close to J c , however, the measured transition times are much longer than the theoretical ones. An explanation of this discrepancy which takes into account thermal effects is presented here. In addition, we give a discussion of the longitudinal propagation observed in impure specimens for currents less than J c (T 0) which also has a thermal origin.
KeywordsTransition Time Heat Conduction Equation Electromagnetic Theory Thermal Origin Longitudinal Propagation
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