Volume 71, Number 4, August 2005
|Page(s)||646 - 650|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||14 July 2005|
A model for the generic alpha relaxation of viscous liquids
Department of Mathematics and Physics (IMFUFA), “Glass and time” Danish National Research Foundation Centre for Viscous Liquid Dynamics Roskilde University - Postbox 260, DK-4000 Roskilde, Denmark
Accepted: 20 June 2005
Dielectric measurements on molecular liquids just above the glass transition indicate that alpha relaxation is characterized by a generic high-frequency loss varying as , whereas deviations from this come from one or more low-lying beta processes (Olsen et al. , Phys. Rev. Lett. 86 (2001) 1271). Assuming that long-wavelength fluctuations dominate the dynamics, a model for the dielectric alpha relaxation based on the simplest coupling between the density and dipole density fields is proposed here. The model, which is solved in second-order perturbation theory in the Gaussian approximation, reproduces the generic features of alpha relaxation.
PACS: 64.70.Pf – Glass transitions / 77.22.Gm – Dielectric loss and relaxation
© EDP Sciences, 2005
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