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Chaotic, memory, and cooling rate effects in spin glasses: Evaluation of the Edwards-Anderson model
Picco, M.; Ricci-Tersenghi, F.; Ritort Farran, Fèlix
Universitat de Barcelona
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 reinitialization 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.
04-05-2010
Propietats magnètiques
Física estadística
Termodinàmica
Sistemes dinàmics diferenciables
Teories no lineals
Caos (Teoria de sistemes)
Vidres de spin
Magnetic properties
Nonlinear dynamical systems
Statistical physics
Thermodynamics
Differentiable dynamical systems
Nonlinear theories
Chaotic behavior in systems
Spin glasses
(c) The American Physical Society, 2001
Artículo
The American Physical Society
         

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