Ginzburg Criterion for Coulombic Criticality

Details Ginzburg Criterion for Coulombic Criticality Ginzburg Criterion for Coulombic Criticality

1996-04-12

arxiv.org/abs/cond-mat/9604077v1

Phys. Rev. Lett. 77, 3561 (1996)

Physics

Condensed Matter

4 pages, revtex, 2 tables (latex2.09 required due to revtex's incompatibility with latex2e tables)

Scientific paper

10.1103/PhysRevLett.77.3561

To understand the range of close-to-classical critical behavior seen in various electrolytes, generalized Debye-Hueckel theories (that yield density correlation functions) are applied to the restricted primitive model of equisized hard spheres. The results yield a Landau-Ginzburg free-energy functional for which the Ginzburg criterion can be explicitly evaluated. The predicted scale of crossover from classical to Ising character is found to be similar in magnitude to that derived for simple fluids in comparable fashion. The consequences in relation to experiments are discussed briefly.

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