Magnon dispersion and anisotropies in SrCu2(BO3)(2)
|Authors||Cheng, Y. F.
Leung, P. W.
|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.|
|Rights||Physical Review B © copyright (2007) American Physical Society. The Journal's web site is located at http://prb.aps.org/|
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