Volume 63, Number 4, August 2003
|Page(s)||603 - 609|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
Intermittent origin of the large violations of the fluctuation-dissipation relations in an aging polymer glass
Ecole Normale Supérieure de Lyon, Laboratoire de Physique, CNRS UMR5672 46 Allée d'Italie, 69364 Lyon Cedex 07, France
Accepted: 10 June 2003
The fluctuation-dissipation relation (FDR) is measured on the dielectric properties of a polymer glass (polycarbonate) in the range 20–100. It is found that after a quench below the glass transition temperature, the fluctuation-dissipation theorem is strongly violated. The amplitude and the persistence time of this violation are decreasing functions of frequency. At frequencies larger than 1 it persists for about 3. The origin of this violation is a highly intermittent dynamics characterized by large fluctuations. The relevance of these results for recent models of aging dynamics is discussed.
PACS: 75.10.Nr – Spin-glass and other random models / 77.22.Gm – Dielectric loss and relaxation / 64.70.Pf – Glass transitions
© EDP Sciences, 2003
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