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We consider fluids where the attractive interaction at distances slightlylarger than the particle size is dominated at larger distances by a repulsivecontribution. A previous investigation of the effects of the competitionbetween attraction and repulsion on the liquid-vapour transition and on thecorrelations is extended to the study of the stability of liquid-vapour phaseseparation with respect to freezing. We find that this long-range repulsivepart of the interaction expands the region where the fluid-solid transitionpreempts the liquid-vapour one, so that the critical point becomes metastableat longer attraction ranges than those required for purely attractivepotentials. Moreover, the large density fluctuations that occur near theliquid-vapour critical point are greatly enhanced by the competition betweenattractive and repulsive forces, and encompass a much wider region than in theattractive case. The decay of correlations for states where the compressibilityis large is governed by two characteristic lengths, and the usualOrnstein-Zernike picture breaks down except for the very neighborhood of thecritical point, where one length reduces to the commonly adopted correlationlength, while the other one saturates at a finite value.Comment: 17 pages, 7 figures. To appear in J. Phys.: Condensed Matter, special  issue: "Topics in Application of Scattering Methods for Investigation of  Structure and Dynamics of Soft Condensed Matter", Fiesole, November 200

Freezing and correlations in fluids with competing interactions