Eur. Phys. J. B 29, 469-479 (2002)
https://doi.org/10.1140/epjb/e2002-00327-2

Deviations from perfect memory in spin glass temperature cycling experiments

¹ Laboratoire de Physique Théorique et Modèles Statistiques, bâtiment 100, Université Paris-Sud, 91405 Orsay, France
² Service de Physique de l'État Condensé, Orme des Merisiers – CEA Saclay, 91191 Gif-sur-Yvette Cedex, France

Corresponding author: ^a sasaki@ipno.in2p3.fr

Received: 23 May 2002
Published online: 14 October 2002

Abstract

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 (perfect memory). For smaller , the deviation from this perfect memory has a striking non monotonous behavior: the `memory anomaly' is negative for small 's, becomes positive for intermediate 's, before vanishing for still larger '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.