Crossover scaling from classical to nonclassical critical behavior

Details Crossover scaling from classical to nonclassical critical behavior Crossover scaling from classical to nonclassical critical behavior

1998-04-24

arxiv.org/abs/cond-mat/9804264v3

Phys.Rev. E58 (1998) 7146-7150

Physics

Condensed Matter

Statistical Mechanics

5 pages, final version to appear in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.58.7146

We study the crossover between classical and nonclassical critical behaviors. The critical crossover limit is driven by the Ginzburg number G. The corresponding scaling functions are universal with respect to any possible microscopic mechanism which can vary G, such as changing the range or the strength of the interactions. The critical crossover describes the unique flow from the unstable Gaussian to the stable nonclassical fixed point. The scaling functions are related to the continuum renormalization-group functions. We show these features explicitly in the large-N limit of the O(N) phi^4 model. We also show that the effective susceptibility exponent is nonmonotonic in the low-temperature phase of the three-dimensional Ising model.

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