Enhanced cooperativity below the caging temperature of o-terphenyl
Other Condensed Matter
2007-05-23 v1
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.
Keywords
Cite
@article{arxiv.cond-mat/0503032,
title = {Enhanced cooperativity below the caging temperature of o-terphenyl},
author = {B. M. Erwin and S. Y. Kamath and R H. Colby},
journal= {arXiv preprint arXiv:cond-mat/0503032},
year = {2007}
}
Comments
8 pages, 2 figures