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

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...

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Bibliographic Details
Published in:arXiv.org 2008-12
Main Authors: Voigtmann, Th, Horbach, J
Format: Article
Language:English
Subjects:
Computer simulation
Coupling (molecular)
Decoupling
Glass
Molecular dynamics
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.0812.3599