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Volume 167, 2013

Lifetimes and lengthscales of structural motifs in a model glassformer

Author affiliations

Abstract

We use a newly-developed method to identify local structural motifs in a popular model glassformer, the Kob–Andersen binary Lennard-Jones mixture. By measuring the lifetimes of a zoo of clusters, we find that 11-membered bicapped square antiprisms, denoted as 11A, have longer lifetimes on average than other structures considered. Other long-lived clusters are similar in structure to the 11A cluster. These clusters group into ramified networks that are correlated with slow particles and act to retard the motion of neighbouring particles. The structural lengthscale associated with these networks does not grow as fast as the dynamical lengthscale ξ4 as the system is cooled, in the range of temperatures our molecular dynamics simulations access. Thus we find a strong, but indirect, correlation between static structural ordering and slow dynamics.

Article information


Submitted
07 May 2013
Accepted
07 Jun 2013
First published
07 Jun 2013

This article is Open Access

Faraday Discuss., 2013,167, 405-423
Article type
Paper

Lifetimes and lengthscales of structural motifs in a model glassformer

A. Malins, J. Eggers, H. Tanaka and C. P. Royall, Faraday Discuss., 2013, 167, 405 DOI: 10.1039/C3FD00078H

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