Unusual ordered phases of highly frustrated magnets: a review

We review ground states and excitations of a quantum antiferromagnet on triangular and other frustrated lattices. We pay special attention to the combined effects of magnetic field h, spatial anisotropy R and spin magnitude S. The focus of the review is on the novel collinear spin density wave and s...

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Bibliographic Details
Published in:Reports on progress in physics 2015-05, Vol.78 (5), p.052502-052502
Main Author: Starykh, Oleg A
Format: Article
Language:English
Subjects:
Antiferromagnetism
Excitation
frustrated lattice
Joints
Lattices
Magnetic fields
Magnets
ordered phases
Phase diagrams
Phases
quantum antiferromagnet
Spin density waves
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Summary:We review ground states and excitations of a quantum antiferromagnet on triangular and other frustrated lattices. We pay special attention to the combined effects of magnetic field h, spatial anisotropy R and spin magnitude S. The focus of the review is on the novel collinear spin density wave and spin nematic states, which are characterized by fully gapped transverse spin excitations with Sz = ± 1. We discuss extensively the R − h phase diagram of the antiferromagnet, both in the large-S semiclassical limit and the quantum S = 1/2 limit. When possible, we point out connections with experimental findings.
ISSN:0034-4885
1361-6633
DOI:10.1088/0034-4885/78/5/052502