Fluctuation-dissipation theorem in an aging colloidal glass

Details Fluctuation-dissipation theorem in an aging colloidal glass Fluctuation-dissipation theorem in an aging colloidal glass

2005-11-14

arxiv.org/abs/cond-mat/0511311v2

Phys. Rev. Lett. 98, 108302 (2007)

Physics

Condensed Matter

Soft Condensed Matter

5 pages,4 figures

Scientific paper

10.1103/PhysRevLett.98.108302

We provide a direct experimental test of the Stokes-Einstein relation as a special case of the fluctuation-dissipation theorem (FDT) in an aging colloidal glass. The use of combined active and passive microrheology allows us to independently measure both the correlation and response functions in this non-equilibrium situation. Contrary to previous reports, we find no deviations from the FDT over several decades in frequency (1 Hz-10 kHz) and for all aging times. In addition, we find two distinct viscoelastic contributions in the aging glass, including a nearly elastic response at low frequencies that grows during aging. This is the clearest change in material properties of the system with aging.

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