Chaotic, memory and cooling rate effects in spin glasses: Is the Edwards-Anderson model a good spin glass?
arXiv:cond-mat/0005541 · doi:10.1103/PhysRevB.63.174412
Abstract
We investigate chaotic, memory and cooling rate effects in the three dimensional Edwards-Anderson model by doing thermoremanent (TRM) and AC susceptibility numerical experiments and making a detailed comparison with laboratory experiments on spin glasses. In contrast to the experiments, the Edwards-Anderson model does not show any trace of re-initialization processes in temperature change experiments (TRM or AC). A detailed comparison with AC relaxation experiments in the presence of DC magnetic field or coupling distribution perturbations reveals that the absence of chaotic effects in the Edwards-Anderson model is a consequence of the presence of strong cooling rate effects. We discuss possible solutions to this discrepancy, in particular the smallness of the time scales reached in numerical experiments, but we also question the validity of the Edwards-Anderson model to reproduce the experimental results.
17 pages, 10 figures. The original version of the paper has been split in two parts. The second part is now available as cond-mat/0102248
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