2002/10/22 by L. Buisson, L. Bellon, S. Ciliberto · 1 citation
Physics and Astronomy · #cond-mat.mtrl-sci #cond-mat.dis-nn
paper · pdf · doi:10.1088/0953-8984/15/11/336
Proceedings of "III workshop on non equilibrium phenomena" (Pisa 2002)
arxiv created 2002/10/22 · arxiv updated 2016/08/31
The fluctuation-dissipation relation (FDR) is measured on the dielectric properties of a gel (Laponite) and of a polymer glass (polycarbonate). For the gel it is found that during the transition from a fluid-like to a solid-like state the fluctuation dissipation theorem is strongly violated. The amplitude and the persistence time of this violation are decreasing functions of frequency. Around 1Hz it may persist for several hours. A very similar behavior is observed in polycarbonate after a quench below the glass transition temperature. In both cases the origin of this violation is a highly intermittent dynamics characterized by large fluctuations. The relevance of these results for recent models of aging are discussed.