Long-range strain correlations in sheared colloidal glasses

Abstract

Glasses behave as solids on experimental time scales due to their slow relaxation. Growing dynamic length scales due to cooperative motion of particles are believed to be central to this slow response. For quiescent glasses, however, the size of the cooperatively rearranging regions has never been observed to exceed a few particle diameters, and the observation of long-range correlations that are signatures of an elastic solid has remained elusive. Here, we provide direct experimental evidence of long-range correlations during the deformation of a dense colloidal glass. By imposing an external stress, we force structural rearrangements that make the glass flow, and we identify long-range correlations in the fluctuations of microscopic strain, and elucidate their scaling and spatial symmetry. The applied shear induces a transition from homogeneous to inhomogeneous flow at a critical shear rate, and we investigate the role of strain correlations in this transition.

11 pages, 3 figures. Accepted for publication in PRL

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• Elementary plastic events in amorphous silica
• Direct Measurement of the Free Energy of Aging Hard-Sphere Colloidal Glasses
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• Structure in Sheared Supercooled Liquids: Dynamical Rearrangements of an Effective System of Icosahedra
• Wall effects on spatial correlations of non-affine strain in a 3D model glass
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• Correlations of strain and plasticity in flowing foam
• Power fluctuations in sheared amorphous materials: A minimal model
• Emergence of linear elasticity from the atomistic description of matter
• Displacement correlations in a two-dimensional colloidal liquid and their relationship with shear strain correlations
• A crossover in spatio-temporal correlations of strain fluctuations in glass forming liquids
• Orthogonal Superposition Rheometry of soft core-shell microgels
• Strain Heterogeneity in Sheared Colloids Revealed by Neutron Scattering
• Non-equilibrium first order transition marks the mechanical failure of glasses