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Enhanced cooperativity below the caging temperature of o-terphenyl

B. M. Erwin·S. Y. Kamath·R H. Colby
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Abstract

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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B. M. Erwin, S. Y. Kamath, R H. Colby. 2005-03-02. Enhanced cooperativity below the caging temperature of o-terphenyl. https://arxiv.org/abs/cond-mat/0503032

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