Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2004-06-29
Pramana Journal of Physics 64, 1109-1119 (2005)
Physics
Condensed Matter
Disordered Systems and Neural Networks
submitted for the Proceedings of Stat Phys 22, Bangalore (India)
Scientific paper
10.1007/BF02704172
In this paper, we review several important features of the out-of-equilibrium dynamics of spin glasses. Starting with the simplest experiments, we discuss the scaling laws used to describe the isothermal aging observed in spin glasses after a quench down to the low temperature phase. We report in particular new results on the sub-aging behaviour of spin glasses. We then discuss the rejuvenation and memory effects observed when a spin glass is submitted to temperature variations during aging, from the point of view of both energy landscape pictures and of real space pictures. We highlight the fact that both approaches point out the necessity of hierarchical processes involved in aging. Finally, we report an investigation of the effect of small temperature variations on aging in spin glass samples with various anisotropies which indicates that this hierarchy depends on the spin anisotropy.
Bert Fabrice
Bouchaud Jean-Philippe
Dupuis Véronique
Hammann Jacques
Ladieu Francois
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