%0 Journal Article
%T Probing the equilibrium dynamics of colloidal hard spheres above the mode-coupling glass transition
%+ Laboratoire des colloïdes, verres et nanomatériaux (LCVN)
%+ Institute of Electronic Structure and Laser (FORTH-IESL)
%+ School of Physics (SUPA)
%A Brambilla, Giovanni
%A El Masri, Djamel
%A Pierno, Matteo
%A Berthier, Ludovic
%A Cipelletti, Luca
%A Petekidis, George
%A B. Schofield, Andrew
%Z CNES, ANR, NoE "Softcomp", MCRTN "Arrested Matter"
%Z 4 pages, 3 figures, published in PRL 102 085703 (2009)
%< avec comité de lecture
%@ 0031-9007
%J Physical Review Letters
%I American Physical Society
%V 102
%P 085703
%8 2009-02-27
%D 2009
%Z 0809.3401
%R 10.1103/PhysRevLett.102.085703
%K glass transition
%K jamming
%K hard spheres
%K mode coupling theory
%K dynamic light scattering
%K simulations
%Z 05.10.-a, 05.20.Jj, 64.70.P-
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Journal articles
%X 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.
%G English
%2 https://hal.science/hal-00323231v2/document
%2 https://hal.science/hal-00323231v2/file/paperPRL_3rd_round_01.pdf
%L hal-00323231
%U https://hal.science/hal-00323231
%~ CNRS
%~ UNIV-MONTP2
%~ LCVN
%~ UNIV-MONTPELLIER
%~ ANR
%~ UM1-UM2