Abstract
The effect of particle size on the magnetically modulated microwave absorption (MMA) signal in Bi 2Sr 2CaCu 2O y and PbBi 2Sr 2Ca 2Cu 3O y powdered samples is reported. It is found that for smaller particle sizes and for increasing temperature, the size of the irreversible hysteretic signal decreases. At the same time the modulation amplitude for which the hysteresis size is a maximum increases. In order to interpret the observed results, a macroscopic model is developed which takes into account the damped motion of fluxons as a loss mechanism, from which an indirect estimate of the penetration depth is obtained.
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