Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets

Zheng, W. H., Fjaerestad, J. O., Singh, R. R. P., McKenzie, R. H. and Coldea, R. (2006) Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets. Physical Review Letters, 96 5: 057201-1-057201-4. doi:10.1103/PhysRevLett.96.057201

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Author Zheng, W. H.
Fjaerestad, J. O.
Singh, R. R. P.
McKenzie, R. H.
Coldea, R.
Title Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2006
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.96.057201
Open Access Status File (Publisher version)
Volume 96
Issue 5
Start page 057201-1
End page 057201-4
Total pages 4
Editor George Basba
Jack Sandweiss
Reinhardt B. Schuhmann
Place of publication United States
Publisher The American Physical Society
Collection year 2006
Language eng
Subject C1
240202 Condensed Matter Physics - Structural Properties
780102 Physical sciences
Abstract We use series expansions to study the excitation spectra of spin-1/2 antiferromagnets on anisotropic triangular lattices. For the isotropic triangular lattice model (TLM), the high-energy spectra show several anomalous features that differ strongly from linear spin-wave theory (LSWT). Even in the Neel phase, the deviations from LSWT increase sharply with frustration, leading to rotonlike minima at special wave vectors. We argue that these results can be interpreted naturally in a spinon language and provide an explanation for the previously observed anomalous finite-temperature properties of the TLM. In the coupled-chains limit, quantum renormalizations strongly enhance the one-dimensionality of the spectra, in agreement with experiments on Cs2CuCl4.
Keyword Physics, Multidisciplinary
Spin-1/2 Heisenberg-antiferromagnet
Anisotropic Triangular Lattice
Finite-temperature Properties
Series Expansions
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 08:25:40 EST