Kovacs effects in an aging molecular liquid

Details Kovacs effects in an aging molecular liquid Kovacs effects in an aging molecular liquid

2003-05-22

arxiv.org/abs/cond-mat/0305526v2

Phys. Rev. Lett. 92, 045504 (2004)

Physics

Condensed Matter

Soft Condensed Matter

RevTeX 4, 4 pages, 5 eps figures

Scientific paper

10.1103/PhysRevLett.92.045504

We study by means of molecular dynamics simulations the aging behavior of a molecular model of ortho-terphenyl. We find evidence of a a non-monotonic evolution of the volume during an isothermal-isobaric equilibration process, a phenomenon known in polymeric systems as Kovacs effect. We characterize this phenomenology in terms of landscape properties, providing evidence that, far from equilibrium, the system explores region of the potential energy landscape distinct from the one explored in thermal equilibrium. We discuss the relevance of our findings for the present understanding of the thermodynamics of the glass state.

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