Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-09-19
Physical Review Letters 102 (2009) 085703
Physics
Condensed Matter
Soft Condensed Matter
4 pages, 3 figures, published in PRL 102 085703 (2009)
Scientific paper
10.1103/PhysRevLett.102.085703
We use dynamic light scattering and computer simulations to study equilibrium dynamics and dynamic heterogeneity in concentrated suspensions of colloidal hard spheres. Our study covers an unprecedented density range and spans seven decades in structural relaxation time, $\ta$, including equilibrium easurements above $\phi_{\rm c}$, the location of the glass transition deduced from fitting our data to mode-coupling theory. Instead of falling out of equilibrium, the system remains ergodic above $\phi_{\rm c}$ and enters a new dynamical regime where $\ta$ increases with a functional form that was not anticipated by previous experiments, while the amplitude of dynamic heterogeneity grows slower than a power law with $\ta$, as found in molecular glass-formers close to the glass transition.
Berthier Ludovic
Brambilla Giovanni
Cipelletti Luca
Masri Djamel El
Petekidis George
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