Observation of Fluctuation-Dissipation-Theorem Violations in a Structural Glass

Abstract

The fluctuation-dissipation theorem (FDT), connecting dielectric susceptibility and polarization noise was studied in glycerol below its glass transition temperature Tg. Weak FDT violations were observed after a quench from just above to just below Tg, for frequencies above the alpha peak. Violations persisted up to 10^5 times the thermal equilibration time of the configurational degrees of freedom under study, but comparable to the average relaxation time of the material. These results suggest that excess energy flows from slower to faster relaxing modes.

Improved discussion; final version to appear in Phys. Rev. Lett. 4 pages, 5 PS figures, RevTex

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