Excitation spectra and ground state properties of the layered spin- 1 2 frustrated antiferromagnets Cs2 Cu Cl4 and Cs2 Cu Br4

Fjaerestad, J. O., Zheng, W., Singh, R. R. P., McKenzie, R. H. and Coldea, R. (2007) Excitation spectra and ground state properties of the layered spin- 1 2 frustrated antiferromagnets Cs2 Cu Cl4 and Cs2 Cu Br4. Physical Review B (Condensed Matter and Materials Physics), 75 17: 174447.1-174447.10. doi:10.1103/PhysRevB.75.174447

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Author Fjaerestad, J. O.
Zheng, W.
Singh, R. R. P.
McKenzie, R. H.
Coldea, R.
Title Excitation spectra and ground state properties of the layered spin- 1 2 frustrated antiferromagnets Cs2 Cu Cl4 and Cs2 Cu Br4
Formatted title
Excitation spectra and ground state properties of the layered spin- 1/2 frustrated antiferromagnets Cs2CuCl4 and Cs2CuBr4
Journal name Physical Review B (Condensed Matter and Materials Physics)   Check publisher's open access policy
ISSN 1098-0121
1550-235X
Publication date 2007-05-31
Year available 2007
Sub-type Article (original research)
DOI 10.1103/PhysRevB.75.174447
Open Access Status File (Publisher version)
Volume 75
Issue 17
Start page 174447.1
End page 174447.10
Total pages 10
Editor Adams, P.D.
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2008
Language eng
Subject 240203 Condensed Matter Physics - Electronic and Magnetic Properties; Superconductivity
C1
780102 Physical sciences
09 Engineering
02 Physical Sciences
Abstract We use series expansion methods to study ground- and excited-state properties in the helically ordered phase of spin-1/2 frustrated antiferromagnets on an anisotropic triangular lattice. We calculate the ground state energy, ordering wave vector, sublattice magnetization and one-magnon excitation spectrum for parameters relevant to Cs2CuCl4 and Cs2CuBr4. Both materials are modeled in terms of a Heisenberg model with spatially anisotropic exchange constants; for Cs2CuCl4 we also take into account the additional Dzyaloshinskii-Moriya (DM) interaction. We compare our results for Cs2CuCl4 with unpolarized neutron scattering experiments and find good agreement. In particular, the large quantum renormalizations of the one-magnon dispersion are well accounted for in our analysis, and inclusion of the DM interaction brings the theoretical predictions for the ordering wave vector and the magnon dispersion closer to the experimental results.
Keyword Bioactive Compounds
Copper compounds
Ground states
Antiferromagnetic materials
Frustration
Magnetisation
Magnons
Heisenberg model
Exchange interactions (electron)
Neutron diffraction
Renormalisation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Mon, 31 Mar 2008, 16:40:03 EST by Jenny Robinson on behalf of School of Mathematics & Physics