Spin wave theory study of neutron intensity, magnetic field, and anisotropy of Type IIA FCC antiferromagnet

TL;DR

This paper uses linear spin wave theory to analyze the spin dynamics, neutron scattering intensity, and effects of magnetic field and anisotropy in a 3D FCC antiferromagnet, with applications to MnO and CoO.

Contribution

It provides a detailed theoretical analysis of spin excitations and neutron scattering in a Type IIA FCC antiferromagnet considering various interactions.

Findings

Calculated neutron scattering intensity profiles.

Identified criteria for FCC materials like MnO and CoO.

Analyzed quantum zero point fluctuations on magnetization.

Abstract

We study the spin dynamics in a 3D quantum antiferromagnet on a face-centered cubic (FCC) lattice. The effects of magnetic field, single-ion anisotropy, and biquadratic interactions are investigated using linear spin wave theory with spins in a canted basis about the Type IIA FCC antiferromagnetic ground state structure which is known to be stable. We calculate the expected finite frequency neutron scattering intensity and give qualitative criteria for typical FCC materials MnO and CoO. The magnetization reduction due to quantum zero point fluctuations is also analyzed.