Critical behavior of the restricted primitive model revisited

Details Critical behavior of the restricted primitive model revisited Critical behavior of the restricted primitive model revisited

2002-01-17

arxiv.org/abs/cond-mat/0201301v2

Physics

Condensed Matter

Statistical Mechanics

17 pages, 11 figures

Scientific paper

10.1063/1.1480009

Reassessment of the critical temperature and density of the restricted primitive model of an ionic fluid by Monte Carlo simulations performed for system sizes with linear dimension up to $L/\sigma=34$ and sampling of $\sim 10^9$ trial moves leads to $T^*_c=0.04917 \pm 0.00002$ and $\rho_c^* =0.080 \pm 0.005$. Finite size scaling analysis based in the Bruce-Wilding procedure gives critical exponents in agreement with those of the 3d Ising universality class. An analysis similar to that proposed by Orkoulas et al [Phys. Rev. E 63, 051507 (2001)], not relying on an a priori knowledge of the universality class, leads to an unaccurate estimate of $T_c^*$ and to unexpected behavior of the specific heat and value of the critical exponent ratio $\gamma/\nu$.

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