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.
https://hal-ens-lyon.archives-ouvertes.fr/ensl-00180053
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
