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Journal Article

Strain Pattern in Supercooled Liquids

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Keim,  Peter
Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Illing, B., Fritschi, S., Hajnal, D., Klix, C., Keim, P., & Fuchs, M. (2016). Strain Pattern in Supercooled Liquids. Physical Review Letters, 117(20): 208002. doi:10.1103/PhysRevLett.117.208002.


Cite as: https://hdl.handle.net/21.11116/0000-0009-84EF-5
Abstract
Investigations of strain correlations at the glass transition reveal unexpected phenomena. The shear strain fluctuations show an Eshelby-strain pattern [∼cos(4θ)/r2], 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.