Berlin 2008 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 8: Glasses II (joint session DF/DY)

DF 8.2: Vortrag

Dienstag, 26. Februar 2008, 14:45–15:00, EB 407

A Gaussian model for the energy landscape of supercooled liquids and its implications — •Andreas Heuer — Inst. f. Phys. Chemie, Corrensstr. 30, 48149 Münster

From the previous analysis [1,2] of the potential energy landscape of molten silica and of a binary Lennard-Jones system a simple picture has emerged for the properties of the potential energy landscape as well as the relation between the energy and the dynamics. Formulating these observations in a general framework one can make specific predictions about the behaviour of supercooled liquids. This involves the dependence of fragility to non-exponentiality, the invalidation of the Stokes-Einstein relation and the relation between thermodynamic and kinetic fragility.

[1] B. Doliwa, A. Heuer, Phys. Rev. Lett. 91, 235501 (2003). [2] A. Saksaengwijit, J. Reinisch, A. Heuer, Phys. Rev. Lett. 93, 235701 (2004).