Abstract
Flux jumping in the intergranular shielding curves and magnetization hysteresis of a Bi2Sr2CaCu2O8+x flux tube has been studied at temperatures close to 4.2 K and at various applied field sweep rates. Large incomplete flux jumps are observed, increasing in number with field sweep rate. For higher sweep rates, large jumps are followed by a number of exponentially decaying small jumps which are explained in terms of the granular nature of the superconductor. The results are compared to conventional flux jumping theory and predictions for high temperature superconductors.
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