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(326) Production(s) de BERTHIER L.
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Thermodynamic fluctuations inmodel glasses
Auteur(s): Berthier L.
Conférence invité: Glassy Systems and Constrained Stochastic Dynamics (Warwick, GB, 2014-06-09)
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Dense assemblies of active andliving particles
Auteur(s): Berthier L.
Conférence invité: ACS 2014 Colloid and surface science symposium (Philadelphie, US, 2014-06-22)
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Thinning or thickening? Complexrheology of dense suspensions
Auteur(s): Berthier L.
Conférence invité: Modeling Granular Media Across Scales (Montpellier, FR, 2014-07-09)
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Jamming and hard spheres
Auteur(s): Berthier L.
Conférence invité: Spin glasses, an old tool for new problems (Cargese, FR, 2014-08-25)
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Thermodynamic fluctuations inmodel glasses
Auteur(s): Berthier L.
Conférence invité: Critical phenomena in random and complex systems (Capri, IT, 2014-09-09)
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Dense assemblies of
self-propelled particle systems
Auteur(s): Berthier L.
(Séminaires)
Cavendish Laboratory (Cambridge, FR), 2014-06-12 |
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A novel approach to numerical measurements of the configurational entropy in supercooled liquids
Auteur(s): Berthier L., Coslovich D.
(Article) Publié:
Proceedings Of The National Academy Of Sciences Of The United States Of America, vol. 111 p.11668 (2014)
Texte intégral en Openaccess :
Ref HAL: hal-01060372_v1
PMID 25071188
Ref Arxiv: 1401.5260
DOI: 10.1073/pnas.1407934111
WoS: 000340097900033
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
44 Citations
Résumé: The configurational entropy is among the key observables to characterize experimentally the formation of a glass. Physically, it quantifies the multiplicity of metastable states in which an amorphous material can be found at a given temperature, and its temperature dependence provides a major thermodynamic signature of the glass transition, which is experimentally accessible. Measurements of the configurational entropy require, however, some approximations which have often led to ambiguities and contradictory results. Here we implement a novel numerical scheme to measure the configurational entropy Sigma(T) in supercooled liquids, using a direct determination of the free energy cost to localize the system within a single metastable state at temperature T. For two prototypical glass-forming liquids, we find that Sigma(T) disappears discontinuously above a temperature T_c, which is slightly lower than the usual estimate of the onset temperature for glassy dynamics. This observation is in good agreement with theoretical expectations, but contrasts sharply with alternative numerical methods. While the temperature dependence of Sigma(T) correlates with the glass fragility, we show that the validity of the Adam-Gibbs relation (relating configurational entropy to structural relaxation time) established in earlier numerical studies is smaller than previously thought, potentially resolving an important conflict between experiments and simulations.
Commentaires: 9 pages; v2 accepted to PNAS Journal: Proc. Natl. Acad. Sci. USA 111, 11668 (2014)
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