Spatially anisotropic Heisenberg Kagome antiferromagnet

Details Spatially anisotropic Heisenberg Kagome antiferromagnet Spatially anisotropic Heisenberg Kagome antiferromagnet

2006-08-17

arxiv.org/abs/cond-mat/0608393v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 6 figures, proceedings of the HFM2006 conference, to appear in a special issue of J. Phys.: Condens. Matter

Scientific paper

10.1088/0953-8984/19/34/349001

In the search for spin-1/2 kagome antiferromagnets, the mineral volborthite has recently been the subject of experimental studies [Hiroi et al.,2001]. It has been suggested that the magnetic properties of this material are described by a spin-1/2 Heisenberg model on the kagome lattice with spatially anisotropic exchange couplings. We report on investigations of the Sp(N) symmetric generalisation of this model in the large N limit. We obtain a detailed description of the dependence of possible ground states on the anisotropy and on the spin length S. A fairly rich phase diagram with a ferrimagnetic phase, incommensurate phases with and without long range order and a decoupled chain phase emerges.

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