Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-03-11
In: Fluctuations and Noise in Materials, edited by D. Popovic, M.B. Weissman and Z.A. Racz. Proceedings of SPIE Vol. 5469 (SPI
Physics
Condensed Matter
Statistical Mechanics
SPIE Proceeding Journal
Scientific paper
10.1117/12.545381
The electric thermal noise has been measured in two aging materials, a colloidal suspension (Laponite) and a polymer (polycarbonate), presenting very slow relaxation towards equilibrium. The measurements have been performed during the transition from a fluid-like to a solid-like state for the gel and after a quench for the polymer. For both materials we have observed that the electric noise is characterized by a strong intermittency, which induces a large violation of the Fluctuation Dissipation Theorem (FDT) during the aging time, and may persist for several hours at low frequency. The statistics of these intermittent signals and their dependance on the quench speed for the polymer or on sample concentration for the gel are studied. The results are in a qualitative agreement with recent models of aging, that predict an intermittent dynamics.
Bellon Ludovic
Buisson L.
Ciccotti Matteo
Ciliberto Sergio
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