Thermodynamic signature of growing amorphous order in glass-forming liquids

Details Thermodynamic signature of growing amorphous order in glass-forming liquids Thermodynamic signature of growing amorphous order in glass-forming liquids

2008-05-28

arxiv.org/abs/0805.4427v1

Nature Physics 4, (2008) 771-775

Physics

Condensed Matter

Disordered Systems and Neural Networks

Scientific paper

10.1038/nphys1050

Although several theories relate the steep slowdown of glass formers to increasing spatial correlations of some sort, standard static correlation functions show no evidence for this. We present results that reveal for the first time a qualitative thermodynamic difference between the high temperature and deeply supercooled equilibrium glass-forming liquid: the influence of boundary conditions propagates into the bulk over larger and larger lengthscales upon cooling, and, as this static correlation length grows, the influence decays nonexponentially. Increasingly long-range susceptibility to boundary conditions is expected within the random firt-order theory (RFOT) of the glass transition, but a quantitative account of our numerical results requires a generalization of RFOT where the surface tension between states fluctuates.

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