Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/2942

Magnon dispersion and anisotropies in SrCu2(BO3)(2)

Authors Cheng, Y. F.
Cépas, O.
Leung, P. W.
Ziman, T.
Issue Date 2007
Source PHYSICAL REVIEW B , v. 75, (14), 2007, Apr, article number 144422
Summary We study the dispersion of the magnons (triplet states) in SrCu2(BO3)(2) including all symmetry-allowed Dzyaloshinskii-Moriya interactions [J. Phys. Chem. Solids 4, 241 (1958); Phys. Rev. 120, 91 (1960)]. We can reduce the complexity of the general Hamiltonian to a simpler form by appropriate rotations of the spin operators. The resulting Hamiltonian is studied by both perturbation theory and exact numerical diagonalization on a 32-site cluster. We argue that the dispersion is dominated by Dzyaloshinskii-Moriya interactions. We point out which combinations of these anisotropies affect the dispersion to linear order, and extract their magnitudes.
Subjects
ISSN 1098-0121
Rights Physical Review B © copyright (2007) American Physical Society. The Journal's web site is located at http://prb.aps.org/
Language English
Format Article
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