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Intermittency in aging

Abstract : 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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Contributor : Ludovic Bellon Connect in order to contact the contributor
Submitted on : Thursday, October 4, 2007 - 4:00:44 PM
Last modification on : Monday, November 30, 2020 - 12:24:01 PM

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Ludovic Bellon, Lionel Buisson, Sergio Ciliberto. Intermittency in aging. Journal of Physics: Condensed Matter, IOP Publishing, 2003, pp.S1163-S1179. ⟨10.1088/0953-8984/15/11/336⟩. ⟨ensl-00176819⟩



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