| Issue |
Europhys. Lett.
Volume 63, Number 4, August 2003
|
|
|---|---|---|
| Page(s) | 603 - 609 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00551-4 | |
| 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
Received:
13
May
2003
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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