Evidence of growing spatial correlations during the aging of glassy glycerol

Abstract

We have measured, as a function of the age $t_a$, the aging of the nonlinear dielectric susceptibility ${\chi }_3$ of glycerol below the glass transition. Whereas the linear susceptibility can be accurately accounted for in terms of an age dependent relaxation time ${\tau }_{\alpha }(t_a)$, this scaling breaks down for ${\chi }_3$, suggesting an increase of the amplitude of ${\chi }_3$. This is a strong indication that the number $N_{corr}$ of molecules involved in relaxation events increases with $t_a$. For $T=0.96\times T_g$, we find that $N_{corr}$ increases by $\sim 10$ when $t_a$ varies from $1\mathrm{ks}$ to $100\mathrm{ks}$. This sheds new light on the relation between length scales and time scales in glasses.

Accepted in Physical Review Letters

References in corpus (7)

• Theoretical perspective on the glass transition and amorphous materials
• The Physics of the Colloidal Glass Transition
• Spontaneous and induced dynamic fluctuations in glass-formers I: General results and dependence on ensemble and dynamics
• Glassy Aging Dynamics
• Aging, rejuvenation and memory : the example of spin glasses
• Physical aging studied by a device allowing for rapid thermal equilibration
• Mode-coupling theory for the dynamic heterogeneity in an aging glass: How Do Glassy Domains Grow?

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