Europhys. Lett.
Volume 60, Number 2, October 2002
Page(s) 316 - 322
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 October 2002
DOI: 10.1209/epl/i2002-00352-3

Europhys. Lett., 60 (2) , pp. 316-322 (2002)

Temperature chaos in a replica-symmetry-broken spin glass model -A hierarchical model with temperature chaos

M. Sasaki1 and O. C. Martin1, 2

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

(Received 20 June 2002; accepted in final form 1 August 2002)

Temperature chaos is an extreme sensitivity of the equilibrium state to a change of temperature. It arises in several disordered systems that are described by the so-called scaling theory of spin glasses, while it seems to be absent in mean-field models. We consider a model spin glass on a tree and show that although it has mean-field behavior with replica symmetry breaking, it manifestly has "strong" temperature chaos. We also show why chaos appears only very slowly with system size.

75.10.Nr - Spin-glass and other random models.

© EDP Sciences 2002