Electrical noise properties in aging materials

Lionel Buisson; Matteo Ciccotti; Ludovic Bellon; Sergio Ciliberto

Electrical noise properties in aging materials

Lionel Buisson ¹ Matteo Ciccotti ¹ Ludovic Bellon ^{1, *} Sergio Ciliberto ¹

* Corresponding author

1 Phys-ENS - Laboratoire de Physique de l'ENS Lyon

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.

Keywords : Aging FDT violation intermittency thermal noise polycarbonate polymer Laponite

Document type :

Conference papers

Domain :

Physics [physics] / Condensed Matter [cond-mat] / Statistical Mechanics [cond-mat.stat-mech]

Complete list of metadatas

https://hal-ens-lyon.archives-ouvertes.fr/ensl-00176792
Contributor : Ludovic Bellon <>
Submitted on : Thursday, October 4, 2007 - 3:46:08 PM
Last modification on : Monday, December 3, 2018 - 11:14:06 AM

Electrical noise properties in aging materials

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Electrical noise properties in aging materials

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