Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2004-11-10
Physics
Condensed Matter
Disordered Systems and Neural Networks
submitted to Physica D
Scientific paper
10.1016/j.physd.2005.03.003
The fluctuation-dissipation relation (FDR) is measured on the dielectric properties a polymer glass (polycarbonate). It is observed that the fluctuation dissipation theorem is strongly violated for 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 a 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.
Buisson L.
Ciliberto Sergio
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