Fig. 2: Comparison of magnon dispersion and THz spectra.
a, b Dispersion of magnon modes along the (h, 0, 0)/(−1, 0, l) direction, as determined from inelastic neutron scattering. Symbols indicate the mode energies for the particular energy scans. The color coding represents the normalized neutron count. c Absorption spectrum with absorption coefficient α measured at 2 K in zero magnetic field for light polarization Eω∥c & Hω∥a. For direct comparison of the zone-center energies, as obtained by the two techniques, all frames share a common vertical scale, with energy/frequency units displayed on the left/right axis.
