We study a model in which particles interact through a hard-core repulsion complemented by a short-ranged attractive potential of the kind found in colloidal suspensions. Combining theoretical and numerical work we locate the line of higher-order glass-transition singularities and its end point-named A(4)-on the fluid-glass line. Close to the A(4) point, we detect logarithmic decay of density correlations anda sublinear power-law increase of the mean square displacement, for time intervals up to 4 orders of magnitude. We establish the presence of the A(4) singularity by studying how the range of the potential affects the time window where anomalous dynamics is observed.
Evidence of a higher-order singularity in dense short-ranged attractive colloids
Zaccarelli E
2003
Abstract
We study a model in which particles interact through a hard-core repulsion complemented by a short-ranged attractive potential of the kind found in colloidal suspensions. Combining theoretical and numerical work we locate the line of higher-order glass-transition singularities and its end point-named A(4)-on the fluid-glass line. Close to the A(4) point, we detect logarithmic decay of density correlations anda sublinear power-law increase of the mean square displacement, for time intervals up to 4 orders of magnitude. We establish the presence of the A(4) singularity by studying how the range of the potential affects the time window where anomalous dynamics is observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
