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Evidence of growing spatial correlations during the aging of glassy glycerol
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Evidence of growing spatial correlations during the aging of glassy glycerol
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Paper
Evidence of growing spatial correlations during the aging of glassy glycerol
2012
Overview
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.
Publisher
Cornell University Library, arXiv.org
Subject
