title: Strain Pattern in Supercooled Liquids.
abstract: 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.
authors.affiliation: University of Konstanz, D-78457 Konstanz, Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Illing
authors.affiliation: University of Konstanz, D-78457 Konstanz, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Fritschi
authors.affiliation: Johannes Gutenberg-University Mainz, D-55099 Mainz, Germany.
authors.forename: David
authors.initials: D
authors.lastname: Hajnal
authors.affiliation: University of Konstanz, D-78457 Konstanz, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Klix
authors.affiliation: University of Konstanz, D-78457 Konstanz, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Keim
authors.affiliation: University of Konstanz, D-78457 Konstanz, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Fuchs