Criticality in the two-dimensional random-bond Ising model

Details Criticality in the two-dimensional random-bond Ising model Criticality in the two-dimensional random-bond Ising model

1996-07-24

arxiv.org/abs/cond-mat/9607175v2

Physics

Condensed Matter

Statistical Mechanics

minor changes, 7 pages LaTex, 8 postscript figures included using epsf; to be published Phys. Rev. B 55 (1997)

Scientific paper

10.1103/PhysRevB.55.1025

The two-dimensional (2D) random-bond Ising model has a novel multicritical point on the ferromagnetic to paramagnetic phase boundary. This random phase transition is one of the simplest examples of a 2D critical point occurring at both finite temperatures and disorder strength. We study the associated critical properties, by mapping the random 2D Ising model onto a network model. The model closely resembles network models of quantum Hall plateau transitions, but has different symmetries. Numerical transfer matrix calculations enable us to obtain estimates for the critical exponents at the random Ising phase transition. The values are consistent with recent estimates obtained from high-temperature series.

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