Quantum -- antiferromagnet on the stacked square lattice: Influence of the interlayer coupling on the ground-state magnetic ordering
arXiv:cond-mat/0604172 · doi:10.1103/PhysRevLett.97.157201
Abstract
Using the coupled-cluster method (CCM) and the rotation-invariant Green's function method (RGM), we study the influence of the interlayer coupling on the magnetic ordering in the ground state of the spin-1/2 - frustrated Heisenberg antiferromagnet (- model) on the stacked square lattice. In agreement with known results for the - model on the strictly two-dimensional square lattice () we find that the phases with magnetic long-range order at small and large are separated by a magnetically disordered (quantum paramagnetic) ground-state phase. Increasing the interlayer coupling the parameter region of this phase decreases, and, finally, the quantum paramagnetic phase disappears for quite small .
4 pages, 3 figures
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