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 ortho-terphenyl glassformer. All the four systems comply with the universal scaling between the viscosity (or the structural relaxation) and the Debye-Waller factor «u2», 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 «u2». Two approximated expressions of the latter, with no and one adjustable parameter, respectively, are derived.

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

Puosi, F.
Primo
Membro del Collaboration Group
;
Leporini, D.
Ultimo
Membro del Collaboration Group
2018

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 ortho-terphenyl glassformer. All the four systems comply with the universal scaling between the viscosity (or the structural relaxation) and the Debye-Waller factor «u2», 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 «u2». Two approximated expressions of the latter, with no and one adjustable parameter, respectively, are derived.
Puosi, F.; Pasturel, A.; Jakse, N.; Leporini, D.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/937942
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