Critical behaviour of a surface reaction model with infinitely many absorbing states

Physics – Condensed Matter

Scientific paper

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10p+5fig, LaTeX+fig in uuencoded PS

Scientific paper

10.1088/0305-4470/27/3/001

In a recent letter [J. Phys. A26, L801 (1993)], Yaldram et al. studied the critical behaviour of a simple lattice gas model of the CO-NO catalytic reaction. The model exhibits a second order nonequilibrium phase transition from an active state into one out of infinitely many absorbing states. Estimates for the critical exponent $\beta$ suggested that the model belongs to a new universality class. The results reported in this article contradict this notion, as estimates for various critical exponents show that the model belongs to the universality class of directed percolation.

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