Phenomenes de vieillissement, rajeunissement et memoire: l'exemple des verres de spin

Details Phenomenes de vieillissement, rajeunissement et memoire: l'exemple des verres de spin Phenomenes de vieillissement, rajeunissement et memoire: l'exemple des verres de spin

2002-05-29

arxiv.org/abs/cond-mat/0205628v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

Paper in french, to appear in the Proceedings of the conference "Materiaux 2002", Tours (France) October 2002. 1 pdf file, 4 p

Scientific paper

The spin glasses are disordered and frustrated magnetic systems. They show aging phenomena which are also a characteristic feature of structural glasses, polymers, dielectrics, colloids, etc. Under a strong enough magnetic field variation, spin glasses can be "rejuvenated", in the same way as glasses under a high enough stress. But spin glasses also display non-trivial "rejuvenation and memory" effects when they are submitted to temperature variations. Comparable phenomena have recently been identified in some polymers and gels, although less sharply pronounced. We propose to describe aging phenomena in disordered systems in terms of a combination of such "temperature-selective" effects with the more usual "temperature-cumulative" processes related to strong cooling rate effects.

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