Two-Order-Parameter Description of Liquids: Critical Phenomena and Phase Separation of Supercooled Liquids

Details Two-Order-Parameter Description of Liquids: Critical Phenomena and Phase Separation of Supercooled Liquids Two-Order-Parameter Description of Liquids: Critical Phenomena and Phase Separation of Supercooled Liquids

1997-06-17

arxiv.org/abs/cond-mat/9706176v1

Physics

Condensed Matter

Soft Condensed Matter

RevTex, 4 pages, 1 eps figures

Scientific paper

Because of the isotropic and disordered nature of liquids, the anisotropy hidden in intermolecular interactions are often neglected. Accordingly, the order parameter describing a simple liquid has so far been believed to be only density. In contrast to this common sense, we propose that two order parameters, namely, density and bond order parameters, are required to describe the phase behavior of liquids since they intrinsically tend to form local bonds. This model gives us clear physical explanations for two poorly-understood phenomena in supercooled liquids: (i) large-scale density fluctuations and (ii) phase separation of a one-component liquid into two liquid phases.

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