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Chaotic, memory, and cooling rate effects in spin glasses: Evaluation of the Edwards-Anderson model

By Marco Picco, Federico Ricci-Tersenghi and Fèlix Ritort Farran

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 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

Topics: Propietats magnètiques, Termodinàmica, Sistemes dinàmics diferenciables, Teories no lineals, Caos (Teoria de sistemes), Vidres de spin, Física estadística, Magnetic properties, Nonlinear dynamical systems, Statistical physics, Thermodynamics, Differentiable dynamical systems, Nonlinear theories, Chaotic behavior in systems, Spin glasses
Publisher: 'American Physical Society (APS)'
Year: 2001
DOI identifier: 10.1103/PhysRevB.63.174412
OAI identifier: oai:diposit.ub.edu:2445/10879
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