Generalized Einstein Relation in an aging colloidal glass

We present an experimental investigation of the Generalized Einstein Relation (GER), a particular form of a fluctuation–dissipation relation, in an out-of-equilibrium visco-elastic fluid. Micrometer beads, used as thermometers, are immersed in an aging colloidal glass to provide both fluctuation and...

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Bibliographic Details
Published inPhysica A Vol. 387; no. 14; pp. 3410 - 3422
Main Authors Abou, Bérengère, Gallet, François, Monceau, Pascal, Pottier, Noëlle
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.2008
Elsevier
Subjects
Aging dynamics
Condensed Matter
Generalized Einstein Relation
Glass transition
Physics
Soft Condensed Matter
Glass transition
05.40.-a
Aging dynamics
Generalized Einstein Relation
64.70.Pf
05.70.-a
relations fluctuation-dissipation
matériaux vitreux
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Summary:We present an experimental investigation of the Generalized Einstein Relation (GER), a particular form of a fluctuation–dissipation relation, in an out-of-equilibrium visco-elastic fluid. Micrometer beads, used as thermometers, are immersed in an aging colloidal glass to provide both fluctuation and dissipation measurements. The deviations from the Generalized Einstein Relation are derived as a function of frequency and aging time. The observed deviations are interpreted as directly related to the change in the glass relaxation times with aging time. In our scenario, deviations are observed in the regime where the observation timescale is of the order of a characteristic relaxation time of the glass.
ISSN:0378-4371
1873-2119
0378-4371
DOI:10.1016/j.physa.2008.02.034