Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-03-22
Phys. Rev. Letter 93, 160603 (2004)
Physics
Condensed Matter
Soft Condensed Matter
4 pages, 4 figures, corrected references, published in Phys. Rev. Letter
Scientific paper
10.1103/PhysRevLett.93.160603
We present a direct experimental measurement of an effective temperature in a colloidal glass of Laponite, using a micrometric bead as a thermometer. The nonequilibrium fluctuation-dissipation relation, in the particular form of a modified Einstein relation, is investigated with diffusion and mobility measurements of the bead embedded in the glass. We observe an unusual non-monotonic behavior of the effective temperature : starting from the bath temperature, it is found to increase up to a maximum value, and then decreases back, as the system ages. We show that the observed deviation from the Einstein relation is related to the relaxation times previously measured in dynamic light scattering experiments.
Abou Bérengère
Gallet Francois
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