2005/03/31 by Jeppe C. Dyre · 2 citations
Chemical Engineering · Materials Science · Physics and Astronomy · #Material Dynamics and Properties #Spectroscopy and Quantum Chemical Studies #Thermodynamic properties of mixtures #cond-mat.soft
paper · pdf · doi:10.1209/epl/i2005-10122-3
published as Europhys. Lett. 71, 646 (2005)
arxiv created 2005/07/28 · openalex publication_date 2005/08/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
Dielectric measurements on molecular liquids just above the glass transition indicate that alpha relaxation is characterized by a generic high-frequency loss varying as ω −1/2 , 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.