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Evidence of double criticality in a fluid model with density-dependent interactions

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2001-03-05
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Almarza, N. G.
Lomba, Enrique
Ruiz, Guiomar
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American Physical Society
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Evidence of a liquid-liquid equilibrium in simple fluids has recently been exposed for a density-dependent pair potential in the framework of a van der Waals theory. Here this double criticality is investigated by means of computer simulation, a perturbation theory, and integral equation theory. It is found that the critical point estimated from the integral equation thermodynamics is not associated with divergent correlations. To cope with these features, a special simulation procedure, based on the definition of local densities, is devised. Monte Carlo calculations confirm the existence of two critical points, in agreement with the predictions of perturbation theory.
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© 2001 The American Physical Society. We acknowledge financial support from the Dirección General de Enseñanza Superior e Investigación Científica (DGESCYT) under Grants No. PB98-0673-C02-02 (N.G. A.), No. PB97-0258-C02-02 (E. L.), and No. PB97-0004-C03-03 (G. R. and C. F. T.).
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[1] P. H. Poole, T. Grande, C. A. Angell, and P. F. McMillan, Science 275, 322 (1997); S. Harrington, R. Zhang, P. H. Poole, F. Sciortino, and H. E. Stanley, Phys. Rev. Lett. 78, 2409 (1997). [2] C. F. Tejero and M. Baus, Phys. Rev. E 57, 4821 (1998). [3] M. Dijkstra and R. van Roij, J. Phys. Condens. Matter 10, 1219 (1998). [4] J. P. Hansen and I. R. McDonald, Theory of Simple Liquids (Academic, Oxford, 1986), 2nd ed. [5] F. Lado, Phys. Lett. 89A, 196 (1982). [6] J. Hafner, From Hamiltonians to Phase Diagrams (Springer, Berlin, 1987). [7] N. G. Almarza, E. Lomba, G. Ruiz, and C. F. Tejero (to be published). [8] M. J. Grimson and M. Silbert, Mol. Phys. 74, 397 (1991). [9] R. van Roij, M. Dijkstra, and J. P. Hansen, Phys. Rev. E 59, 2010 (1999). [10] J. Clément-Cottuz, S. Amokrane, and C. Regnaut, Phys. Rev. E 61, 1692 (2000).
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