Weak temperature dependence of ageing of structural properties in atomistic model glassformers

Thomas Jenkinson, Peter Crowther, Francesco Turci, C. Patrick Royall*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)
293 Downloads (Pure)

Abstract

Ageing phenomena are investigated from a structural perspective in two binary Lennard-Jones glassformers, the Kob-Andersen and Wahnström mixtures. In both, the geometric motif assumed by the glassformer upon supercooling, the locally favoured structure (LFS), has been established. The Kob-Andersen mixture forms bicapped square antiprisms; the Wahnström model forms icosahedra. Upon ageing, we find that the structural relaxation time has a time-dependence consistent with a power law. However, the LFS population and potential energy increase and decrease, respectively, in a logarithmic fashion. Remarkably, over the time scales investigated, which correspond to a factor of 104 change in relaxation times, the rate at which these quantities age appears almost independent of temperature. Only at temperatures far below the Vogel-Fulcher-Tamman temperature do the ageing dynamics slow.

Original languageEnglish
Article number054501
JournalJournal of Chemical Physics
Volume147
Issue number5
Early online date7 Aug 2017
DOIs
Publication statusPublished - 7 Aug 2017

Keywords

  • glasses
  • ageing
  • rejuvenation

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