Visualizing the collective motions responsible for the α and β relaxations in a model glass
- 1 December 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review E
- Vol. 48 (6), 4359-4363
- https://doi.org/10.1103/physreve.48.4359
Abstract
Maps of the spatial distributions of the relaxation times are obtained from Monte Carlo simulations of the facilitated kinetic Ising model. The β relaxation, acting over short and intermediate time scales, is observed to occur in localized pockets. The slow α relaxation is governed by the fraction of these pockets which are free to move. This physical picture is able to account for the non-Arrhenius temperature dependence of the time scales of the α process, the scaling of the relaxation function in the β region, and the value of the relaxation function at the crossover time.Keywords
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