A Double-Transition Scenario for Anomalous Diffusion in Glass-Forming Mixtures

Details A Double-Transition Scenario for Anomalous Diffusion in Glass-Forming Mixtures A Double-Transition Scenario for Anomalous Diffusion in Glass-Forming Mixtures

2008-12-18

arxiv.org/abs/0812.3599v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

We study by molecular dynamics computer simulation a binary soft-sphere mixture that shows a pronounced decoupling of the species' long-time dynamics. Anomalous, power-law-like diffusion of small particles arises, that can be understood as a precursor of a double-transition scenario, combining a glass transition and a separate small-particle localization transition. Switching off small-particle excluded-volume constraints slows down, rather than enhances, small-particle transport. The data are contrasted with results from the mode-coupling theory of the glass transition.

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