Evidence of a higher-order singularity in dense short-ranged attractive colloids

Francesco Sciortino; Piero Tartaglia; Emanuela Zaccarelli

doi:10.1103/physrevlett.91.268301

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Evidence of a higher-order singularity in dense short-ranged attractive colloids

Francesco Sciortino·Piero Tartaglia·Emanuela Zaccarelli

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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 and sub linear power-law increase of the mean square displacement, for time intervals up to four order of magnitudes. 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.

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Francesco Sciortino, Piero Tartaglia, Emanuela Zaccarelli. 2005-03-04. Evidence of a higher-order singularity in dense short-ranged attractive colloids. https://doi.org/10.1103/physrevlett.91.268301

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