The motion of quantized fluxes in ring-shaped YBa2Cu3O7 samples has been observed under pulsed magnetic field in the 15 K to critical temperature (T c) range. Successive flux jumps have been observed in a low-J c sample, where J c is the transport critical current density. All these jumps are determined by the Lorentz force, and not by the thermal avalanche conditions. It is suggested that the trains of jumps are caused by the weakened pinning force in a degraded sample.
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Itoh et al. (1994) studied this question.
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