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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Article dans une revue
Physica D: Nonlinear Phenomena, Elsevier, 2005, 204 (1), pp.14
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Contributeur : Sergio Ciliberto <>
Soumis le : mercredi 17 octobre 2007 - 15:30:28
Dernière modification le : jeudi 19 avril 2018 - 14:54:03
Document(s) archivé(s) le : dimanche 11 avril 2010 - 21:56:51


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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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