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

TL;DR

This study investigates low temperature magnetic excitations near the percolation threshold in Fe_x Zn_{1-x} F_2 using neutron scattering and simulations, revealing insights into magnetic behavior at critical concentrations.

Contribution

It provides experimental neutron scattering data and a localized classical model simulation for magnetic excitations near the percolation threshold in Fe_x Zn_{1-x} F_2.

Findings

Neutron scattering measurements at x=0.25 and 0.31.

Simulation accurately reproduces excitation energies and intensities.

Insights into magnetic excitations near the percolation threshold.

Abstract

The low temperature excitations in the anisotropic antiferromagnetic Fe_{1-x} Zn_x F_2 for x=0.25 and 0.31, at and just above the magnetic percolation threshold concentration x_p=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.