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Slow stretched-exponential and fast compressed-exponential relaxation from local event dynamics.

Published version
Peer-reviewed

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Article

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Abstract

We propose an atomistic model for correlated particle dynamics in liquids and glasses predicting both slow stretched-exponential relaxation (SER) and fast compressed-exponential relaxation (CER). The model is based on the key concept of elastically interacting local relaxation events. SER is related to slowing down of dynamics of local relaxation events as a result of this interaction, whereas CER is related to the avalanche-like dynamics in the low-temperature glass state. The model predicts temperature dependence of SER and CER seen experimentally and recovers the simple, Debye, exponential decay at high temperature. Finally, we reproduce SER to CER crossover across the glass transition recently observed in metallic glasses.

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Keywords

glass transition, glasses, liquids, non-equilibrium physics, relaxation

Journal Title

J Phys Condens Matter

Conference Name

Journal ISSN

0953-8984
1361-648X

Volume Title

33

Publisher

IOP Publishing