Rejuvenation and memory in model spin glasses in three and four dimensions

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Jiménez, S.
Pérez Gaviro, S.
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American Physical Society
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We numerically study aging for the Edwards-Anderson model in three and four dimensions using different temperature-change protocols. In D=3, time scales a thousand times larger than in previous work are reached with the Spin Update Engine SUE machine. Deviations from cumulative aging are observed in the nonmonotonic time behavior of the coherence length. Memory and rejuvenation effects are found in a temperature-cycle protocol, revealed by vanishing effective waiting times. Similar effects are reported for the D=3 site-diluted ferromagnetic Ising model without chaos. However, rejuvenation is reduced if off-equilibrium corrections to the fluctuation-dissipation theorem are considered. Memory and rejuvenation are quantitatively describable in terms of the growth regime of the spin-glass coherence length.
© 2005 American Physical Society. We thank G. Parisi, A. Tarancón, L. A. Fernández, F. Ricci-Tersenghi, E. Marinari, and A. Maiorano for discussions. Numerical simulations have been carried out in the dedicated computer SUE and in the PC clusters RTN3 and RTN4, of U. de Zaragoza. S.J. and S.P.-G. acknowledge financial support from DGA Spain and S.J. from the ECHP program, Contract No. HPRN-CT-2002-00307, DYGLAGEMEM. This work has been financially supported by MEC Spain though research Contract Nos. FPA2000-0956, FPA2001-1813, BFM2003-08532, and FIS2004-05073-C04.
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