Abstract
We present a numerical study of the spin-[Formula presented] bilayer Heisenberg antiferromagnet with random interlayer dimer dilution. From the temperature dependence of the uniform susceptibility and a scaling analysis of the spin correlation length we deduce the ground state phase diagram as a function of nonmagnetic impurity concentration [Formula presented] and bilayer coupling [Formula presented]. At the site percolation threshold, there exists a multicritical point at small but nonzero bilayer coupling [Formula presented]. The magnetic properties of the single-layer material [Formula presented] near the percolation threshold appear to be controlled by the proximity to this new quantum critical point.
Original language | English (US) |
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Journal | Physical review letters |
Volume | 89 |
Issue number | 17 |
DOIs | |
State | Published - 2002 |