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Magnon dispersion and anisotropies in SrCu2(BO3)2

Authors Cheng, Yiu Fai
Cépas, O.
Leung, Pak Wo
Ziman, T.
Issue Date 2007
Source Physical Review B , v. 75, (14), April 2007, 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.
ISSN 1098-0121
Rights © 2007 American Physical Society
Language English
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