On the Extraction of Exchange Parameters in Transition-Metal Perovskites

Abstract

The extraction of exchange parameters from measured spin-wave dispersion relations has severe limitations particularly for magnetic compounds such as the transition-metal perovskites, where the nearest-neighbor exchange parameter usually dominates the couplings between the further-distant-neighbor spins. Very precise exchange parameters beyond the nearest-neighbor spins can be obtained by neutron spectroscopic investigations of the magnetic excitation spectra of isolated multimers in magnetically diluted compounds. This is exemplified for manganese trimers in the mixed three- and two-dimensional perovskite compounds KMnxZn1-xF3 and K2MnxZn1-xF4, respectively. It is shown that the small exchange couplings between the second-nearest and the third-nearest neighboring spins can be determined unambiguously and with equal precision as the dominating nearest-neighbor exchange coupling.

20 pages, 5 figures

References in corpus (4)

• Neutron Scattering Studies of the Ferroelectric Distortion and Spin Dynamics in the Type-1 Multiferroic Perovskite Sr0.56Ba0.44MnO3
• Magnetic excitation spectrum of LuFe2O4 measured with inelastic neutron scattering
• Propagation of defects in doped magnetic materials of different dimensionality
• Defect propagation in one-, two-, and three-dimensional compounds doped by magnetic atoms

Cited by in corpus (4)

• Towards Kitaev Spin Liquid in 3d Transition Metal Compounds
• Disentangling orbital and spin exchange interactions for Co${}^{2+}$ on a rocksalt lattice
• Spin-Phonon Coupling and High Pressure Phase Transitions of RMnO3 (R= Ca and Pr): An Inelastic Neutron Scattering and First Principle Studies
• Effect of Sr doping on the magnetic exchange interactions in manganites