Spatially anisotropic Heisenberg kagome antiferromagnet

In the search for spin-1/2 kagome antiferromagnets, the mineral volborthite has recently been the subject of experimental studies (Hiroi et al 2001 J. Phys. Soc. Japan 70 3377; Fukaya et al 2003 Phys. Rev. Lett. 91 207603; Bert et al 2004 J. Phys.: Condens. Matter 16 S829; Bert et al 2005 Phys. Rev....

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Published inJournal of physics. Condensed matter Vol. 19; no. 14; pp. 145255 - 145255 (6)
Main Authors Apel, W, Yavors’kii, T, Everts, H-U
Format Journal Article Conference Proceeding
LanguageEnglish
Published Bristol IOP Publishing 11.04.2007
Institute of Physics
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
General theory and models of magnetic ordering
Magnetic properties and materials
Physics
Phase diagrams
Ground states
Incommensurate phases
Kagomé lattices
Anisotropy
Antiferromagnetic materials
Long-range order
Heisenberg model
Exchange interactions
Magnetic properties
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Summary:In the search for spin-1/2 kagome antiferromagnets, the mineral volborthite has recently been the subject of experimental studies (Hiroi et al 2001 J. Phys. Soc. Japan 70 3377; Fukaya et al 2003 Phys. Rev. Lett. 91 207603; Bert et al 2004 J. Phys.: Condens. Matter 16 S829; Bert et al 2005 Phys. Rev. Lett. 95 087203). 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 symmetric generalization of this model in the large 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.
Bibliography:SourceType-Scholarly Journals-2
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ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/19/14/145255