Ref HAL: hal-00323231_v2
PMID 19257755
Ref Arxiv: 0809.3401
DOI: 10.1103/PhysRevLett.102.085703
WoS: 000263816200034
Ref. & Cit.: NASA ADS
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290 Citations
Résumé:

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.

Commentaires: 4 pages, 3 figures, published in PRL 102 085703 (2009)