Origin of the slow dynamics and the aging of a soft glass Auteur(s): Mazoyer Sylvain, Cipelletti L., Ramos L. (Article) Publié: Physical Review Letters, vol. 97 p.238301 (2006) Texte intégral en Openaccess : Ref HAL: hal-00021876_v2 Ref Arxiv: cond-mat/0603739 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote Résumé: We study by light microscopy a soft glass consisting of a compact arrangement of polydisperse elastic spheres. We show that its slow and non-stationary dynamics results from the unavoidable small fluctuations of temperature, which induce intermittent local mechanical shear in the sample, because of thermal expansion and contraction. Temperature-induced shear provokes both reversible and irreversible rearrangements whose amplitude decreases with time, leading to an exponential slowing down of the dynamics with sample age. Commentaires: published in PRL 97, 238301, 2006 |