Journal
PHYSICAL REVIEW B
Volume 78, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.184417
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Funding
- U. S. Department of Energy Office of Science [DE-AC02-07CH11358]
- Los Alamos Neutron Science Center at Los Alamos National Laboratory
- U. S. Department of Energy [W-7405-ENG- 36]
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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 LaMnO3 (A-type antiferromagnet), LaVO3 (C type), and LaFeO3 (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.
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