Strain Pattern in Supercooled Liquids

Investigations of strain correlations at the glass transition reveal unexpected phenomena. The shear strain fluctuations show an Eshelby-strain pattern [∼cos(4θ)/r^{2}], characteristic of elastic response, even in liquids, at long times. We address this using a mode-coupling theory for the strain fl...

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Bibliographic Details
Published inPhysical review letters Vol. 117; no. 20; p. 208002
Main Authors Illing, Bernd, Fritschi, Sebastian, Hajnal, David, Klix, Christian, Keim, Peter, Fuchs, Matthias
Format Journal Article
LanguageEnglish
Published United States 11.11.2016
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Summary:Investigations of strain correlations at the glass transition reveal unexpected phenomena. The shear strain fluctuations show an Eshelby-strain pattern [∼cos(4θ)/r^{2}], characteristic of elastic response, even in liquids, at long times. We address this using a mode-coupling theory for the strain fluctuations in supercooled liquids and data from both video microscopy of a two-dimensional colloidal glass former and simulations of Brownian hard disks. We show that the long-ranged and long-lived strain signatures follow a scaling law valid close to the glass transition. For large enough viscosities, the Eshelby-strain pattern is visible even on time scales longer than the structural relaxation time τ and after the shear modulus has relaxed to zero.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.117.208002