Line Shape of the Magnetic Excitations in Substitutionally Disordered Antiferromagnets

Abstract

The neutron scattering from the magnetic excitations in the substitutionally disordered antiferromagnet, ${\mathrm{Mn}}_{0.68}$ ${\mathrm{Zn}}_{0.32}$ ${\mathrm{F}}_2$, has been measured. The results show structure in the line shape which is similar to that predicted by some of the calculations based on the coherent-potential approximation and to that obtained in recent computer simulations.