Abstract
Magnetic hysteresis under pulsed magnetic fields up to 35 T was measured at 4.2 K in a zero-field cooled sintered (Bi,Pb)-2223 high-temperature superconductor with different field sweeping rates. The width of the hysteresis loops and the remanent magnetization exhibit a regular increasing dependence with the speed of the field sweep up to 120 T/s, and then enter a steep decreasing regime for faster sweeping rates which cannot be explained in the framework of current models for the critical state in high- T c superconductors. A magnetocaloric scenario was invoked to analyze the results.
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