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- Does the Adam-Gibbs relation hold in simulated supercooled liquids? doi link

Auteur(s): Ozawa M., Scalliet C., Ninarello A. S., Berthier L.

(Article) Publié: The Journal Of Chemical Physics, vol. 151 p.084504 (2019)
Texte intégral en Openaccess : arxiv


Ref HAL: hal-02302300_v1
Ref Arxiv: 1905.08179
DOI: 10.1063/1.5113477
WoS: WOS:000483889300020
Ref. & Cit.: NASA ADS
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9 Citations
Résumé:

We perform stringent tests of thermodynamic theories of the glass transition over the experimentally relevant temperature regime for several simulated glass-formers. The swap Monte Carlo algorithm is used to estimate the configurational entropy and static point-to-set lengthscale, and careful extrapolations are used for the relaxation times. We first quantify the relation between configurational entropy and the point-to-set lengthscale in two and three dimensions. We then show that the Adam-Gibbs relation is generally violated in simulated models for the experimentally relevant time window. Collecting experimental data for several supercooled molecular liquids, we show that the same trends are observed experimentally. Deviations from the Adam-Gibbs relation remain compatible with random first order transition theory, and may account for the reported discrepancies between Kauzmann and Vogel-Fulcher-Tammann temperatures. Alternatively, they may also indicate that even near $T_g$ thermodynamics is not the only driving force for slow dynamics.



Commentaires: 13 pages, 8 figures. Réf Journal: J. Chem. Phys. 151, 084504 (2019)