Direct-space investigation of the ultraslow ballistic dynamics of a soft glass
arXiv:0809.3995 · doi:10.1103/PhysRevE.79.011501
Abstract
We use light microscopy to investigate the aging dynamics of a glass made of closely packed soft spheres, following a rapid transition from a fluid to a solid-like state. By measuring time-resolved, coarse-grained displacements fields, we identify two classes of dynamical events, corresponding to reversible and irreversible rearrangements, respectively. The reversible events are due to the small, experimentally unavoidable fluctuations of the temperature imposed to the sample, leading to transient thermal expansions and contractions that cause shear deformations. The irreversible events are plastic rearrangements, induced by the repeated shear cycles. We show that the displacement due to the irreversible rearrangements grows linearly with time, both on average and at a local level. The velocity associated with this ballistic motion decreases exponentially with sample age, accounting for the observed slowing down of the dynamics. The displacement field due to the irreversible rearrangements has a vortex-like structure and is spatially correlated over surprisingly long distances.
arXiv comment10 pages, 7 figures, submitted to PRE
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- Theoretical perspective on the glass transition and amorphous materials
- Subdiffusion and intermittent dynamic fluctuations in the aging regime of concentrated hard spheres
- Scaling of relaxation and excess entropy in plastically deformed amorphous solids
- Observation and Characterization of the Vestige of the Jamming Transition in a Thermal 3D System
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- Physics and Mathematics of the Photoluminescence of Complex Systems