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

Abstract

The recent neutron-scattering data for spin-wave dispersion in $\mathrm{HoMn}{\mathrm{O}}_3$ 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 $\mathrm{HoMn}{\mathrm{O}}_3$ 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.

4 pages, 3 figures

References in corpus (8)

• Theory of the helical spin crystal: a candidate for the partially ordered state of MnSi
• Magnetic Order and Spin Dynamics in Ferroelectric HoMnO${}_3$
• Quasi two-dimensional antiferromagnet on a triangular lattice RbFe(MoO4)2
• Theory of helical spin crystals: phases, textures and properties
• Generalized Quantum Secret Sharing
• Unconventional spin fluctuations in the hexagonal antiferromagnet YMnO${}_3$
• Finite-$U$ induced competing interactions, frustration, and quantum phase transition in a triangular-lattice antiferromagnet
• Spin-wave spectrum in La2CuO4 -- double occupancy and competing interaction effects

Cited by in corpus (1)

• Correlation effects on magnetic frustration in the triangular-lattice Hubbard model