Fluctuation-dissipation relations and energy landscape in an out-of-equilibrium strong-glass-forming liquid.
We study the out-of-equilibrium dynamics following a temperature jump in a model for silica, a strong liquid, 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 with the slow out-of-equilibrium structural degrees of freedom. We find the striking and unexplained result that, different from the fragile liquid cases, T(eff) is smaller than the bath temperature.
Scala
Antonio
A
Dipartimento di Fisica e INFM, Universitá di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185, Roma, Italy.
Valeriani
Chantal
C
Sciortino
Francesco
F
Tartaglia
Piero
P