Neutron scattering experiments and simulations near the magnetic percolation threshold of Fe_x Zn_{1-x} F_2

Abstract

The low temperature excitations in the anisotropic antiferromagnetic Fe1−xZnxF2 for x = 0.25 and 0.31, at and just above the magnetic percolation threshold concentration xp = 0.25, were measured using inelastic neutron scattering. The excitations were simulated for x = 0.31 using a localized, classical excitation model, which accounts well for the energies and relative intensities of the excitations observed in the scattering experiments.