Fluctuation-dissipation relations and energy landscape in an out-of-equilibrium strong glass-forming liquid

Details Fluctuation-dissipation relations and energy landscape in an out-of-equilibrium strong glass-forming liquid Fluctuation-dissipation relations and energy landscape in an out-of-equilibrium strong glass-forming liquid

2003-01-10

arxiv.org/abs/cond-mat/0301143v2

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.90.115503

We study the out-of-equilibrium dynamics following a temperature-jump in a model for a strong liquid, BKS-silica, and compare it with the well known case of fragile liquids. We calculate the fluctuation-dissipation relation, from which it is possible to estimate an effective temperature $T_{eff}$ associated to the slow out-of-equilibrium structural degrees of freedom. We find the striking and unexplained result that, differently from the fragile liquid cases, $T_{eff}$ is smaller than the bath temperature.

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