title: Higher-order glass-transition singularities in colloidal systems with attractive interactions.
abstract: The transition from a liquid to a glass in colloidal suspensions of particles interacting through a hard core plus an attractive square-well potential is studied within the mode-coupling-theory framework. When the width of the attractive potential is much shorter than the hard-core diameter, a reentrant behavior of the liquid-glass line and a glass-glass-transition line are found in the temperature-density plane of the model. For small well-width values, the glass-glass-transition line terminates in a third-order bifurcation point, i.e., in a A3 (cusp) singularity. On increasing the square-well width, the glass-glass line disappears, giving rise to a fourth-order A4 (swallow-tail) singularity at a critical well width. Close to the A3 and A4 singularities the decay of the density correlators shows stretching of huge dynamical windows, in particular logarithmic time dependence.
authors: Irish Centre for Colloid Science and Biomaterials, University College Dublin, Belfield.
authors: K
authors: K
authors: Dawson
authors: G
authors: G
authors: Foffi
authors: M
authors: M
authors: Fuchs
authors: W
authors: W
authors: Götze
authors: F
authors: F
authors: Sciortino
authors: M
authors: M
authors: Sperl
authors: P
authors: P
authors: Tartaglia
authors: T
authors: T
authors: Voigtmann
authors: E
authors: E
authors: Zaccarelli