Spin dynamics of YMnO3 studied via inelastic neutron scattering and the anisotropic Hubbard model (original) (raw)
We have investigated the spin dynamics of YMnO 3 by inelastic neutron scattering and determined the spin-wave dispersion at low temperature. The spin-wave dispersions at low temperature have been analyzed with a simple nearest-neighbor anisotropic Heisenberg model and also by an anisotropic Hubbard model. Best fits are obtained only in the strong-coupling limit ͑U / t Ͼ ϳ 15͒, with planar exchange energy J =4t 2 / U Ӎ 2.4 meV, and anisotropy terms D z = U x Ј − U z Ј Ӎ 0.32 meV and D y = U x Ј − U y Ј Ӎ 0.033 meV. We have shown that in the strong-coupling limit, the anisotropic Hubbard model maps into the anisotropic Heisenberg model.
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