Anisotropic Hubbard model on a triangular lattice -- spin dynamics in Ho Mn O_3

Details Anisotropic Hubbard model on a triangular lattice -- spin dynamics in Ho Mn O_3 Anisotropic Hubbard model on a triangular lattice -- spin dynamics in Ho Mn O_3

2005-06-19

arxiv.org/abs/cond-mat/0506475v3

Pramana - Journal of Physics, 70, 163 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

The recent neutron-scattering data for spin-wave dispersion in $\rm Ho Mn O_3$ are well described by an anisotropic Hubbard model on a triangular lattice with a planar (XY) spin anisotropy. Best fit indicates that magnetic excitations in $\rm Ho Mn O_3$ correspond to the strong-coupling limit $U/t > \sim 15$, with planar exchange energy $J=4t^2/U \simeq 2.5$meV and planar anisotropy $\Delta U \simeq 0.35$meV.

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