Abstract
Reversible properties of the remanent magnetic moment, M rem, in superconducting submicron- and micron-size Y–Ba–Cu–O particles and thin films are investigated with a SQUID magnetometer. In micron-size particles and thin films a monotonic increase of M rem was observed when decreasing the temperature. In submicron particles, the same monotonic behaviour is observed at first but at low temperatures an unusual reentrant behaviour was found: M rem decreased when cooling the sample below 6 K. This phenomenon is independent of the direction of the thermal cycle. Possible mechanisms of this effect, such as midgap states in the quasiparticle excitation spectrum and defect-induced localization of Cooper pairs, are discussed.
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