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

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.

arXiv comment8 pages, 7 figures

References in corpus (4)

• Spin Order due to Orbital Fluctuations: Cubic Vanadates
• Magnetic neutron scattering study of YVO3: Evidence for an orbital Peierls state
• Stabilization of charge ordering in La_(1/3)Sr_(2/3)FeO_(3-d) by magnetic exchange
• Spin stiffness and quantum fluctuations in C-type and A-type antiferromagnets

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