Europhys. Lett.
Volume 48, Number 6, December 1999
Page(s) 699 - 705
Section Condensed matter: electronic structure, electrical, magnetic and optical properties
Published online 01 September 2002
DOI: 10.1209/epl/i1999-00541-0

Europhys. Lett, 48 (6), pp. 699-705 (1999)

A search for fluctuation-dissipation theorem violations in spin-glasses from susceptibility data

L. F. Cugliandolo 1, D. R. Grempel 2, J. Kurchan 3 and E. Vincent 2

1 Laboratoire de Physique Théorique de l'Ecole Normale Supérieure de Paris
24 rue Lhomond, F-75231 Paris
Laboratoire de Physique Théorique et Hautes Energies, Universités de Paris VI and VII
Tour 24, 5ème étage - 4 Place Jussieu, F-75252 Paris, France
2 Service de Physique de l'Etat Condensé, CEA-Saclay - F-91191 Gif-sur-Yvette, France
3 Laboratoire de Physique de l'Ecole Normale Supérieure de Lyon
46 Allée d'Italie, F-69364 Lyon, France

(received 12 July 1999; accepted 26 October 1999)

PACS. 75.50Lk - Spin glasses and other random magnets.
PACS. 75.10Nr - Spin glass and other random models.
PACS. 75.40Gb - Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.).


We propose an indirect way of studying the fluctuation-dissipation relation in spin-glasses that only uses available susceptibility data. It is based on a dynamic extension of the Parisi-Toulouse approximation and a Curie-Weiss treatment of the average magnetic couplings. We present the results of the analysis of several sets of experimental data obtained from various samples.


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