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Magnon dispersion and anisotropies in SrCu2(BO3)2

Authors Cheng, Yiu Fai HKUST affiliated (currently or previously)
Cépas, O.
Leung, Pak Wo View this author's profile
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
Format Article
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