Europhys. Lett.
Volume 62, Number 6, June 2003
Page(s) 869 - 875
Section Condensed matter: structure, mechanical and thermal properties
Published online 01 June 2003
DOI: 10.1209/epl/i2003-00453-y
Europhys. Lett., 62 (6) , pp. 869-875 (2003)

Frequency-domain study of relaxation in a spin glass model for the structural glass transition

F. Rao1, A. Crisanti2 and F. Ritort3

1  Department of Biochemistry, University of Zurich Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
2  Dipartimento di Fisica, Università di Roma "La Sapienza" and INFM, unità di Roma, I and SMC - P. le A. Moro 2, 00185, Roma, Italy
3  Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona Diagonal 647, 08028 Barcelona, Spain

(Received 28 January 2003; accepted in final form 22 April 2003)

We have computed the time-dependent susceptibility for the finite-size mean-field random orthogonal model (ROM). We find that for temperatures above the mode-coupling temperature, the imaginary part of the susceptibility $\chi''(\nu)$ obeys the scaling forms proposed for glass-forming liquids. Furthermore, as the temperature is lowered the peak frequency of $\chi''$ decreases, following a Vogel-Fulcher law with a critical temperature remarkably close to the known critical temperature $T_{\ab{c}}$, where the configurational entropy vanishes.

64.60.-i - General studies of phase transitions.
64.70.Pf - Glass transitions.
75.10.Nr - Spin-glass and other random models.

© EDP Sciences 2003