Spin-liquid phase in a spatially anisotropic frustrated antiferromagnet: a Schwinger boson mean-field approach

Merino, Jaime, Holt, Michael and Powell, Ben J. (2014) Spin-liquid phase in a spatially anisotropic frustrated antiferromagnet: a Schwinger boson mean-field approach. Physical Review B - Condensed Matter and Materials Physics, 89 24: . doi:10.1103/PhysRevB.89.245112

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Author Merino, Jaime
Holt, Michael
Powell, Ben J.
Title Spin-liquid phase in a spatially anisotropic frustrated antiferromagnet: a Schwinger boson mean-field approach
Journal name Physical Review B - Condensed Matter and Materials Physics   Check publisher's open access policy
ISSN 1550-235X
1098-0121
1538-4489
Publication date 2014-06-15
Year available 2014
Sub-type Article (original research)
DOI 10.1103/PhysRevB.89.245112
Open Access Status File (Publisher version)
Volume 89
Issue 24
Total pages 11
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2015
Language eng
Formatted abstract
We explore the effect of the third-nearest neighbors on the magnetic properties of the Heisenberg model on an anisotropic triangular lattice. We obtain the phase diagram of the model using Schwinger boson mean-field theory. Competition between Néel, spiral, and collinear magnetically ordered phases is found as we vary the ratios of the nearest J1, next-nearest J2, and third-nearest J3 neighbor exchange couplings. A spin-liquid phase is stabilized between the spiral and collinear ordered states when J2/J11.8, for rather small J3/J10.1. The lowest-energy two-spinon dispersions relevant to neutron scattering experiments are analyzed and compared to semiclassical magnon dispersions finding significant differences in the spiral and collinear phases between the two approaches. The results are discussed in the context of the anisotropic triangular materials: Cs2CuCl4 and Cs2CuBr4 and layered organic materials, κ-(BEDT-TTF)2X, and Y[Pd(dmit)2]2.
Keyword Spin-liquid phase
Antiferromagnet
Schwinger boson
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article ID: 245112

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2015 Collection
 
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