Enhanced cooperativity below the caging temperature of o-terphenyl

Details Enhanced cooperativity below the caging temperature of o-terphenyl Enhanced cooperativity below the caging temperature of o-terphenyl

2005-03-02

arxiv.org/abs/cond-mat/0503032v1

Physics

Condensed Matter

Other Condensed Matter

8 pages, 2 figures

Scientific paper

The utility of a cooperative length scale for describing the dynamics of glass-forming liquids is shown using literature data on o-terphenyl. Molecular dynamics and Monte Carlo simulations reveal a distribution of cooperative fractal events below the caging temperature T_A. Guided by these results, we show how to extract the size of slow regions in any glass-forming liquid from probe rotation/diffusion measurements, which agrees quantitatively with 4-D NMR and grows steadily as temperature is lowered below T_A. We clarify why this length must also be the size of the largest cooperative events.

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