Volume 67, Number 5, September 2004
|Page(s)||779 - 785|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 August 2004|
Independence of the relaxation of a supercooled fluid from its microscopic dynamics: Need for yet another extension of the mode-coupling theory
Department of Chemistry, Colorado State University - Fort Collins, CO 80525, USA
Accepted: 18 June 2004
Using Brownian dynamics computer simulations, we show that the relaxation of a supercooled Brownian system is qualitatively the same as that of a Newtonian system. In particular, near the so-called mode-coupling transition temperature, dynamic properties of the Brownian system exhibit the same deviations from power law behavior as those of the Newtonian one. Thus, similar dynamical events cut off the idealized mode-coupling transition in Brownian and Newtonian systems. We discuss implications of this finding for extended mode-coupling theory. In addition, we point out and discuss the difference between our findings and experimental results, and present an alternative interpretation of some of our simulation data.
PACS: 61.20.Lc – Time-dependent properties; relaxation / 64.70.Pf – Glass transitions / 61.43.Fs – Glasses
© EDP Sciences, 2004
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