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The spin- 1 2 Heisenberg antiferromagnet on a 1 7 -depleted triangular lattice: Ground-state properties

2002; American Physical Society; Volume: 65; Issue: 22 Linguagem: Inglês

10.1103/physrevb.65.224405

1095-3795

D. Schmalfuß, Piotr Tomczak, J. Schulenburg, Johannes Richter,

Theoretical and Computational Physics

A linear spin-wave approach, a variational method and exact diagonlization are used to investigate the magnetic long-range order (LRO) of the spin-1/2 Heisenberg antiferromagnet on a two-dimensional 1/7-depleted triangular (maple leaf) lattice consisting of triangles and hexagons only. This lattice has z=5 nearest neighbors and its coordination number z is therefore between those of the triangular (z=6) and the kagome (z=4) lattices. Calculating spin-spin correlations, sublattice magnetization, spin stiffness, spin-wave velocity and spin gap we find that the classical 6-sublattice LRO is strongly renormalized by quantum fluctuations, however, remains stable also in the quantum model.