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Title: Magnon dispersion and anisotropies in SrCu2(BO3)2
Authors: Cheng, Y. F.
Cépas, O.
Ziman, T.
Leung, Pak Wo
Keywords: Strontium compounds
Copper compounds
Antiferromagnetic materials
Triplet state
Exchange interactions (electron)
Spin Hamiltonians
Perturbation theory
Magnetic anisotropy
Issue Date: 19-Apr-2007
Citation: Physical review. B, v. 75, 144422
Abstract: 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.
Rights: Physical Review B © copyright (2007) American Physical Society. The Journal's web site is located at
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