Decoupling phenomena in supercooled liquids: Signatures in the energy landscape

Details Decoupling phenomena in supercooled liquids: Signatures in the energy landscape Decoupling phenomena in supercooled liquids: Signatures in the energy landscape

2005-10-26

arxiv.org/abs/cond-mat/0510705v1

Physics

Condensed Matter

Soft Condensed Matter

Submitted for publication

Scientific paper

10.1103/PhysRevLett.96.187801

A significant deviation from the Debye model of rotational diffusion in the dynamics of orientational degrees of freedom in an equimolar mixture of ellipsoids of revolution and spheres is found to begin precisely at a temperature at which the average inherent structure energy of the system starts falling with drop in temperature. We argue that this onset temperature corresponds to the emergence of the alpha-process as a distinct mode of orientational relaxation. Equally important, we find that the coupling between the rotational and translational diffusion breaks down at a still lower temperature where a sharp change occurs in the temperature dependence of the average inherent structure energy.

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