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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