Intermittency in aging

Details Intermittency in aging Intermittency in aging

2002-10-22

arxiv.org/abs/cond-mat/0210490v1

Physics

Condensed Matter

Materials Science

Proceedings of "III workshop on non equilibrium phenomena" (Pisa 2002)

Scientific paper

10.1088/0953-8984/15/11/336

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.

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