Abstract
Magnetically modulated microwave absorption (MMA) is performed on powdered high- T c Bi 2Sr 2Ca 2Cu 3O y , Bi 2Sr 2Ca 1Cu 2O y and Y 1Ba 2Cu 3O y materials. The temperature dependence of the zero field microwave absorption maximum and low field hysteresis is presented. It is observed that the zero field line and low field hysteresis depend on the particle size of powdered materials. We show that a model, which combines a model based on the existence of a critical state with pinning and depinning of fluxons during a modulation cycle and a weak link model, can account for the observed temperature and particle-size dependence of zero field line and hysteresis.
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