Discretization Dependence of Criticality in Model Fluids: a Hard-core Electrolyte

Details Discretization Dependence of Criticality in Model Fluids: a Hard-core Electrolyte Discretization Dependence of Criticality in Model Fluids: a Hard-core Electrolyte

2004-02-10

arxiv.org/abs/cond-mat/0402275v1

Physics

Condensed Matter

Statistical Mechanics

4 pages including 4 figures

Scientific paper

10.1103/PhysRevLett.92.185703

Grand canonical simulations at various levels, $\zeta=5$-20, of fine- lattice discretization are reported for the near-critical 1:1 hard-core electrolyte or RPM. With the aid of finite-size scaling analyses it is shown convincingly that, contrary to recent suggestions, the universal critical behavior is independent of $\zeta$ $(\grtsim 4)$; thus the continuum $(\zeta\to\infty)$ RPM exhibits Ising-type (as against classical, SAW, XY, etc.) criticality. A general consideration of lattice discretization provides effective extrapolation of the {\em intrinsically} erratic $\zeta$-dependence, yielding $(\Tc^ {\ast},\rhoc^{\ast})\simeq (0.0493_{3},0.075)$ for the $\zeta=\infty$ RPM.

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