Multi-critical point in a diluted bilayer Heisenberg quantum antiferromagnet
arXiv:cond-mat/0206355 · doi:10.1103/PhysRevLett.89.177201
Abstract
The S=1/2 Heisenberg bilayer antiferromagnet with randomly removed inter-layer dimers is studied using quantum Monte Carlo simulations. A zero-temperature multi-critical point (p*,g*) at the classical percolation density p=p* and inter-layer coupling g* approximately 0.16 is demonstrated. The quantum critical exponents of the percolating cluster are determined using finite-size scaling. It is argued that the associated finite-temperature quantum critical regime extends to zero inter-layer coupling and could be relevant for antiferromagnetic cuprates doped with non-magnetic impurities.
4 pages, 6 figures. v2: only minor changes; accepted for publication in Phys. Rev. Lett
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