Flux Flow Dynamics in Superconducting Films
Current-voltage characteristics (CVC) and their first-order derivatives have been measured for niobium and Pb-22% Bi alloy films in magnetic fields in the temperature range 0.2 to 0.5 Tc. CVC derivatives were found to have a peak that the authors attributed to the incoherent movement of flux lines in the weakly supercritical range due to their interaction with pins. Peak amplitude and position strongly depend on the magnetic field. This effect occurred for all magnetic fields higher than 0.2 Hc2, temperatures, and specimen orientations. A model of the distribution function of pins qualitively accounts for experimental data obtained. The theoretical description must be modified by taking into account the interaction between flux lines.
KeywordsMagnetic Field Flux Line Flux Flow Specimen Orientation Superconducting Film
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