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Comparing dynamic correlation lengths from an approximation to the four-point dynamic susceptibility and from the picosecond vibrational dynamics | D. Fragiadakis
; R. Casalini
; C.M. Roland
; | Date: |
1 Sep 2011 | Abstract: | Recently a new approach to the determination of dynamic correlation lengths,
{xi}, for supercooled liquids, based on the properties of the slow
(picosecond) vibrational dynamics, was carried out [L. Hong, V.N. Novikov, and
A.P. Sokolov, Phys. Rev. E 83, 061508 (2011)]. Although these vibrational
measurements are typically conducted well below the glass transition
temperature, Tg, the assumption is that the structure of the liquid is frozen
at Tg, so that the {xi} characterize dynamic heterogeneity in the supercooled
liquid state. We compare {xi} from this method to values calculated using an
approximation to the four-point dynamic susceptibility. For 26 different
materials we find good correlation between the two measures; moreover, the
pressure dependences are consistent within the large experimental error.
However, {xi} from Boson peak measurements above Tg have a different, and
unrealistic, temperature dependence. | Source: | arXiv, 1109.0167 | Services: | Forum | Review | PDF | Favorites |
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