Abstract
The observation of a very anomalous hysteresis in the resistivity behavior of granular high temperature ceramic superconductors, under the influence of a low magnetic field, in the critical temperature region [TR, Tc] is discussed. After eliminating various a priori possible mechanisms, such as that of superconductive glass state, we present arguments strongly suggesting that the effect comes from flux pinning effects and the peculiar grain “boundary condition” effects.
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