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In Phys. Rev. Lett. 84, 4204 (2000) (cond-mat/9905379), Kato et al. presentedquantum Monte Carlo results indicating that the critical concentration ofrandom non-magnetic sites in the two-dimensional antiferromagnetic Heisenbergmodel equals the classical percolation density; pc=0.407254. The data alsosuggested a surprising dependence of the critical exponents on the spin S ofthe magnetic sites, with a gradual approach to the classical percolationexponents as S goes to infinity. I here argue that the exponents in fact areS-independent and equal to those of classical percolation. The apparentS-dependent behavior found by Kato et al. is due to temperature effects in thesimulations as well as a quantum effect that masks the true asymptotic scalingbehavior for small lattices.Comment: Comment on Phys. Rev. Lett. 84, 4204 (2000), by K. Kato et al.; 1  page, 1 figur

Comment on “Quantum Phase Transition of the Randomly Diluted Heisenberg Antiferromagnet on a Square Lattice”