Intermittent origin of the large violations of the fluctuation dissipation relations in an aging polymer glass

Details Intermittent origin of the large violations of the fluctuation dissipation relations in an aging polymer glass Intermittent origin of the large violations of the fluctuation dissipation relations in an aging polymer glass

2003-06-18

arxiv.org/abs/cond-mat/0306462v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

to be published in Europhysics Letters

Scientific paper

10.1209/epl/i2003-00551-4

The fluctuation-dissipation relation (FDR) is measured on the dielectric properties of a polymer glass (polycarbonate)in the range $20mHz - 100Hz$. 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 1Hz it persists for about $3h$. 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 are discussed.

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