Critical Behavior of Disordered Systems with a Free Surface

Details Critical Behavior of Disordered Systems with a Free Surface Critical Behavior of Disordered Systems with a Free Surface

2007-10-18

arxiv.org/abs/0710.3465v1

Physics

Condensed Matter

Statistical Mechanics

19 pages, 2 figures

Scientific paper

10.1134/S106377610804016X

The behavior of homogeneous and disordered systems with a free boundary is described on the basis of group theory in the two-loop approximation directly in three-dimensional space. The effect of the free boundary on the regime of the bulk critical behavior is revealed. It is shown that the boundedness of the system slightly affects the regime of the bulk critical behavior in the case of the ordinary transition, whereas this effect is more noticeable in the case of the special transition. Surface critical phenomena are described for homogeneous and disordered systems, and the critical exponents are calculated in the two-loop approximation. It is shown that the effect of impurities is insignificant in the special phase transition, whereas it is more noticeable in the ordinary phase transition. The derived critical exponents are compared with the computer-simulation results.

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