Deviations from Perfect Memory in Spin Glass Temperature Cycling Experiments

Details Deviations from Perfect Memory in Spin Glass Temperature Cycling Experiments Deviations from Perfect Memory in Spin Glass Temperature Cycling Experiments

2002-05-07

arxiv.org/abs/cond-mat/0205137v2

Eur. Phys. J. B 29, 469 (2002)

Physics

Condensed Matter

Disordered Systems and Neural Networks

12 pages, 12 figures, 2 tables, the tables are modified, the text is slightly changed

Scientific paper

10.1140/epjb/e2002-00327-2

We study the deviations from perfect memory in negative temperature cycle spin glass experiments. It is known that the a.c. susceptibility after the temperature is raised back to its initial value is superimposed to the reference isothermal curve for large enough temperature jumps DT (perfect memory). For smaller DT, the deviation from this perfect memory has a striking non monotonous behavior: the memory anomaly is negative for small DT's, becomes positive for intermediate DT's, before vanishing for still larger DT's. We show that this interesting behavior can be reproduced by simple Random Energy trap models. We discuss an alternative interpretation in terms of droplets and temperature chaos.

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