Abstract
We report on memory effects observed in the time dependence of the magnetization of a superconducting Y-Ba-Cu-O single crystal. As in spin-glasses, the decay rate is not uniquely determined. It exhibits a characteristic change at time equal to the waiting time during which the specimen was kept at a given temperature and magnetic field before a field perturbation is applied at time . This phenomenon, seen for the first time in a superconductor, reveals the glassy nature of the superconducting state in the high- oxides.
- Received 26 September 1988
DOI:https://doi.org/10.1103/PhysRevLett.62.681
©1989 American Physical Society