Strong pressure-energy correlations in van der Waals liquids

Details Strong pressure-energy correlations in van der Waals liquids Strong pressure-energy correlations in van der Waals liquids

2007-02-06

arxiv.org/abs/cond-mat/0702146v4

Phys. Rev. Lett. 100, 015701 (2008).

Physics

Condensed Matter

Statistical Mechanics

Phys. Rev. Lett., in press

Scientific paper

10.1103/PhysRevLett.100.015701

Strong correlations between equilibrium fluctuations of the configurational parts of pressure and energy are found in the Lennard-Jones liquid and other simple liquids, but not in hydrogen-bonding liquids like methanol and water. The correlations, that are present also in the crystal and glass phases, reflect an effective inverse power-law repulsive potential dominating fluctuations, even at zero and slightly negative pressure. In experimental data for supercritical Argon, the correlations are found to be approximately 96%. Consequences for viscous liquid dynamics are discussed.

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