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American Physical Society, Physical Review Letters, 20(103), 2009

DOI: 10.1103/physrevlett.103.205901

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Double Transition Scenario for Anomalous Diffusion in Glass-Forming Mixtures

Journal article published in 2009 by T.-H. Voigtmann ORCID, J. Horbach
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This paper is available in a repository.

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Abstract

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.