Order from disorder in a kagomé antiferromagnet

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Abstract

A Heisenberg antiferromagnet on a kagomé lattice is highly degenerate in the classical limit. I show that quantum fluctuations lift the degeneracy and yeild the low-energy branch of spin-wave excitations with a velocity which is a factor S-1/3 smaller than for conventional spin waves. The relevance of these results to the experiments on the stacked kagomé antiferromagnet SrCr8-xGa4+xO19 is discussed.

Original languageEnglish (US)
Pages (from-to)832-835
Number of pages4
JournalPhysical Review Letters
Volume69
Issue number5
DOIs
StatePublished - Jan 1 1992

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