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Fast dynamics perspective on the breakdown of the Stokes-Einstein law in fragile glassformers

By F. Puosi, A. Pasturel, N. Jakse and D. Leporini

Abstract

The breakdown of the Stokes-Einstein (SE) law in fragile glassformers is examined by Molecular-Dynamics simulations of atomic liquids and polymers and consideration of the experimental data concerning the archetypical OTP glassformer. All the four systems comply with the universal scaling between the viscosity (or the structural relaxation) and the Debye-Waller factor $\langle u^2\rangle$, the mean square amplitude of the particle rattling in the cage formed by the surrounding neighbors. It is found that the SE breakdown is scaled in a master curve by a reduced $\langle u^2\rangle$. Two approximated expressions of the latter, with no and one adjustable parameters respectively, are derived.Comment: accepted for publication in J Chem Phy

Topics: Condensed Matter - Soft Condensed Matter, Condensed Matter - Disordered Systems and Neural Networks
Publisher: 'AIP Publishing'
Year: 2018
DOI identifier: 10.1063/1.5025614
OAI identifier: oai:arXiv.org:1802.05077

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