Compressing nearly hard sphere fluids increases glass fragilityL. Berthier1 and T. A. Witten2
1 Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587, Université Montpellier II and CNRS 34095 Montpellier, France, EU
2 James Franck Institute and Department of Physics, The University of Chicago - 929 E. 57th Street, Chicago, IL 60637, USA
received on 23 February 2009; accepted in final form by L. F. Cugliandolo on 11 March 2009; published April 2009
published online 8 April 2009
We use molecular dynamics to investigate the glass transition occurring at large volume fraction, , and low temperature, T, in assemblies of soft repulsive particles. We find that equilibrium dynamics in the (, T)-plane obey a form of dynamic scaling in the proximity of a critical point at T = 0 and , which should correspond to the ideal glass transition of hard spheres. This glass point, “point G", is distinct from athermal jamming thresholds. A remarkable consequence of scaling behaviour is that the dynamics at fixed passes smoothly from that of a strong glass to that of a very fragile glass as increases beyond . Correlations between fragility and various physical properties are explored.
05.10.-a - Computational methods in statistical physics and nonlinear dynamics.
05.20.Jj - Statistical mechanics of classical fluids.
64.70.P- - Glass transitions of specific systems.
© EPLA 2009