Long-range strain correlations in sheared colloidal glasses

Details Long-range strain correlations in sheared colloidal glasses Long-range strain correlations in sheared colloidal glasses

2011-10-13

arxiv.org/abs/1110.2884v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 3 figures. Accepted for publication in PRL

Scientific paper

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.

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