Scientist working in the Center for Computational Science & e-Systems, Japan Atomic Energy Agency.

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Strong geometric frustration in model glassformers

Icosahedra form as Wahnström liquids are cooled.

Icosahedra form as Wahnström liquids cool down. This diagram forms Fig. 5 of the journal article.


We consider three popular model glassformers, the Kob-Andersen and Wahnström binary Lennard-Jones models and weakly polydisperse hard spheres. Although these systems exhibit a range of fragilities, all feature a rather similar behaviour in their local structure approaching dynamic arrest. In particular we use the dynamic topological cluster classification to extract a locally favoured structure which is particular to each system. These structures form percolating networks, however in all cases there is a strong decoupling between structural and dynamic lengthscales. We suggest that the lack of growth of the structural lengthscale may be related to strong geometric frustration.

C. P. Royall, A. Malins, A. J. Dunleavy & R. Pinney
Journal of Non-Crystalline Solids article in press (2014)

PDF: download
DOI: http://dx.doi.org/10.1016/j.jnoncrysol.2014.08.017
ArXiv: http://arxiv.org/abs/1407.5787


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