Spin waves in vanadium sesquioxideV2O3

Abstract

We have carried out inelastic neutron scattering measurements of the spin waves propagating along the [$00l$] trigonal axis and along the [$\mathrm{hh}0\mathrm{}$] axis in the antiferromagnetic phase of ${\mathrm{V}}_2$ ${\mathrm{O}}_3$. We find an energy gap in the spin-wave spectrum at the zone center of 4.75 meV. We obtain exchange parameters and the anisotropy energy from these data using a nearest-neighbor and next-nearest-neighbor Heisenberg Hamiltonian model.