Off equilibrium fluctuations in a polymer glass.

Abstract : The fluctuation-dissipation relation (FDR) is measured on the dielectric properties of a polymer glass (polycarbonate). It is observed that the fluctuation dissipation theorem is strongly violated after a quench from above to below the glass transition temperature. The amplitude and the persistence time of this violation are decreasing functions of frequency. Around $1Hz$ it may persist for several hours. The origin of this violation is a highly intermittent dynamics characterized by large fluctuations and strongly non-Gaussian statistics. The intermittent dynamics depends on the quenching rate and it disappears after slow quenches. The relevance of these results for recent models of aging are discussed.
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Submitted on : Wednesday, October 17, 2007 - 3:30:28 PM
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Lionel Buisson, Sergio Ciliberto. Off equilibrium fluctuations in a polymer glass.. Physica D: Nonlinear Phenomena, Elsevier, 2005, 204 (1), pp.14. ⟨ensl-00180053⟩

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