Abstract
Ac susceptibility measurements of a ceramic weak-coupled superconductor in very low ac fields (2mG, 111 Hz) are reported. We present evidence for the observation of the magnetic irreversibility following a ZFC-FC thermal cycling by means of ac susceptibility measurements. It is shown that this technique also reflect local magnetic field effects in granular superconductors, as previously suggested in microwave surface resistance and I-V characteristics.
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