Increasing the density melts ultrasoft colloidal glasses Auteur(s): Berthier L., Moreno Angel J., Szamel G. (Article) Publié: Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 82 p.060501(R) (2010) Texte intégral en Openaccess : Ref HAL: hal-00597223_v1 PMID 21230636 Ref Arxiv: 1009.4531 DOI: 10.1103/PhysRevE.82.060501 WoS: 000286746500001 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 73 Citations Résumé: We use theory and simulations to investigate the existence of amorphous glassy states in ultrasoft colloids. We combine the hyper-netted chain approximation with mode-coupling theory to study the dynamic phase diagram of soft repulsive spheres interacting with a Hertzian potential, focusing on low temperatures and large densities. At constant temperature, we find that an amorphous glassy state is entered upon compression, as in colloidal hard spheres, but the glass unexpectedly melts when density increases further. We attribute this re-entrant fluid-glass transition to particle softness, and correlate this behaviour to previously reported anomalies in soft systems, thus emphasizing its generality. The predicted fluid-glass-fluid sequence is confirmed numerically. Commentaires: 4 pages, 3 figs Journal: Phys. Rev. E 82, 060501(R) (2010) |