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Proceedings Paper

Electrical noise properties in aging materials
Author(s): Lionel Buisson; Matteo Ciccotti; Ludovic Bellon; Sergio Ciliberto
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Paper Abstract

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.

Paper Details

Date Published: 25 May 2004
PDF: 15 pages
Proc. SPIE 5469, Fluctuations and Noise in Materials, (25 May 2004); doi: 10.1117/12.545381
Show Author Affiliations
Lionel Buisson, Ecole Normale Superieure de Lyon (France)
Matteo Ciccotti, Ecole Normale Superieure de Lyon (France)
Ludovic Bellon, Ecole Normale Superieure de Lyon (France)
Sergio Ciliberto, Ecole Normale Superieure de Lyon (France)

Published in SPIE Proceedings Vol. 5469:
Fluctuations and Noise in Materials
Dragana Popovic; Michael B. Weissman; Zoltan A. Racz, Editor(s)

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