Understanding fragility in supercooled Lennard-Jones mixtures. I. Locally preferred structures

Abstract

We reveal the existence of systematic variations of isobaric fragility in different supercooled Lennard-Jones binary mixtures by performing molecular dynamics simulations. The connection between fragility and local structures in the bulk is analyzed by means of a Voronoi construction. We find that clusters of particles belonging to locally preferred structures form slow, long-lived domains, whose spatial extension increases by decreasing temperature. As a general rule, a more rapid growth, upon supercooling, of such domains is associated to a more pronounced super-Arrhenius behavior, hence to a larger fragility.

14 pages, 14 figures, minor revisions, one figure added

References in corpus (3)

• Mapping the magic numbers in binary Lennard-Jones clusters
• The favoured cluster structures of model glass formers
• On the relationship between structure and dynamics in a supercooled liquid

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