| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-1077 - C8-1078 | |
| DOI | https://doi.org/10.1051/jphyscol:19888493 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-1077-C8-1078
DOI: 10.1051/jphyscol:19888493
1 Laboratoire d'optique Physique, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05, France
2 Department of Physics, University of California, Los Angeles Ca 90024, U.S.A.
J. Phys. Colloques 49 (1988) C8-1077-C8-1078
DOI: 10.1051/jphyscol:19888493
CROSS-OVER FROM SHORT TO LONG TIME BEHAVIOUR IN THE REMANENT MAGNETIZATION DECAY OF SPIN-GLASSES
N. Bontemps1 et R. Orbach21 Laboratoire d'optique Physique, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05, France
2 Department of Physics, University of California, Los Angeles Ca 90024, U.S.A.
Abstract
The decay of the thermoremanent magnetization in the insulating spin-glass Eu0.4Sr0.6S starting from equilibrium, exhibits two time regimes, a power law and a stretched exponential. When aging effects are present, we argue that the cross-over time when one regime switches into the other increases with the waiting time and saturates at a finite value as the system achieves thermal equilibrium before the field is switched off. We tentatively relate that behaviour to the route in configuration space which optimizes the magnetization decay towards zero.