Determination of the exchange anisotropy in perovskite antiferromagnets using powder inelastic neutron scattering

TL;DR

This paper presents a method to determine magnetic exchange constants in anisotropic perovskite antiferromagnets using powder inelastic neutron scattering, enabling rapid analysis without single-crystal measurements.

Contribution

It introduces a new procedure for extracting anisotropic exchange interactions from powder neutron scattering data, simplifying and speeding up magnetic characterization.

Findings

Successfully measured spin wave densities-of-states for LaMnO₃, LaVO₃, and LaFeO₃.

Determined in-plane and out-of-plane exchange constants from powder data.

The method allows systematic study of magnetic evolution in perovskites.

Abstract

A procedure is outlined for the determination of magnetic exchange constants in anisotropic perovskite anitferromagnets using powder inelastic neutron scattering. Spin wave densities-of-states are measured using time-of-flight inelastic neutron scattering for LaMnO$_{3}$ ($A$-type antiferromagnet), LaVO$_{3}$ ($C$-type), and LaFeO$_{3}$ ($G$-type) and compared to Heisenberg model calculations. The anisotropy of in-plane ($J_{ab}$) and out-of-plane ($J_{c}$) exchange constants can be obtained from the data. The procedure quickly determines the magnetic exchange interactions without the need for single-crystal dispersion measurements and allows for rapid systematic studies of the evolution of magnetism in perovskite systems.