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http://hdl.handle.net/1783.1/2942
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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
Magnons
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 http://prb.aps.org/ |
| URI: | http://hdl.handle.net/1783.1/2942 |
| Appears in Collections: | PHYS Journal/Magazine Articles
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Files in This Item:
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Size | Format |
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| PhysRevB_75_144422[1].pdf | | 432Kb | Adobe PDF | View/Open |
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