Volume 100, Number 5, December 2012
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||07 December 2012|
Shear-induced anisotropic decay of correlations in hard-sphere colloidal glasses
1 Institute of Physics, University of Amsterdam - Science Park 904, 1098 XH Amsterdam, The Netherlands, EU
2 Max-Planck-Institut für Eisenforschung - 40237 Düsseldorf, Germany, EU
3 Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-University Bochum Bochum, Germany, EU
Received: 28 May 2012
Accepted: 15 November 2012
Spatial correlations of microscopic fluctuations are investigated via real-space experiments and computer simulations of colloidal glasses under steady shear. It is shown that while the distribution of one-particle fluctuations is always isotropic regardless of the relative importance of shear as compared to thermal fluctuations, their spatial correlations show a marked sensitivity to the competition between shear-induced and thermally activated relaxation. Correlations are isotropic in the thermally dominated regime, but develop strong anisotropy as shear dominates the dynamics of microscopic fluctuations. We discuss the relevance of this observation for a better understanding of flow heterogeneity in sheared amorphous solids.
PACS: 61.43.Fs – Glasses / 62.20.F- – Deformation and plasticity / 82.70.Dd – Colloids
© EPLA, 2012
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