Paramagnetic neutron scattering spectra from the localized ferromagnet ${\mathrm{Pd}}_2$MnSn have been reexamined at T=210 K (1.1$T_C$), primarily at large-q values. The measured profiles are compared with theoretical profiles calculated according to the three-pole approximation theory from the magnetic exchange constants up to the sixth-nearest-neighbor shell. The calculated linewidths agree reasonably with the observed widths, but not the line shapes; the data show no indication of side peaks at finite energy, as predicted by the theory for the higher-q values. The measurements can be fitted well, however, by a parametrized spectral weight function based on the three-pole approximation.

• Received 21 February 1989

DOI:https://doi.org/10.1103/PhysRevB.40.4243