Spin-waves in CsMnF3

The spin-wave dispersion relations were determined by neutron inelastic scattering for the high symmetry directions (0 0 ξ) and (ξ 0 0) in the hexagonal antiferromagnet CsMnF 3 . The observed data were satisfactorily fitted to a theoretical model with two nearest-neighbour exchange constants, J 12 = 0.134 ± 0.003 THz and J 23 = 0.094 ± 0.0105 THz, and with one second-nearest-neighbour exchange constant, J 35 = −0.0138 ± 0.003 THz. An effective …