Non-monotonic temperature evolution of dynamic correlations in glass-forming liquids - Laboratoire Charles Coulomb (L2C) Accéder directement au contenu
Article Dans Une Revue Nature Physics Année : 2012

Non-monotonic temperature evolution of dynamic correlations in glass-forming liquids

Walter Kob
  • Fonction : Auteur
  • PersonId : 881760
Sandalo Roldan-Vargas
  • Fonction : Auteur
Ludovic Berthier

Résumé

The viscosity of glass-forming liquids increases by many orders of magnitude if their temperature is lowered by a mere factor of 2-3. Recent studies suggest that this widespread phenomenon is accompanied by spatially heterogeneous dynamics, and a growing dynamic correlation length quantifying the extent of correlated particle motion. Here we use a novel numerical method to detect and quantify spatial correlations that reveal a surprising non-monotonic temperature evolution of spatial dynamical correlations, accompanied by a second length scale that grows monotonically and has a very different nature. Our results directly unveil a dramatic qualitative change in atomic motions near the mode-coupling crossover temperature, which involves no fitting or indirect theoretical interpretation. These findings impose severe new constraints on the theoretical description of the glass transition, and open several research perspectives, in particular for experiments, to confirm and quantify our observations in real materials.

Dates et versions

hal-00667220 , version 1 (07-02-2012)

Identifiants

Citer

Walter Kob, Sandalo Roldan-Vargas, Ludovic Berthier. Non-monotonic temperature evolution of dynamic correlations in glass-forming liquids. Nature Physics, 2012, 8, pp.164-167. ⟨10.1038/nphys2133⟩. ⟨hal-00667220⟩
160 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More