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Extraction of exchange parameters in transition-metal perovskites

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Furrer A., Podlesnyak A., Krämer K. W.,
Project Dimensional and Anisotropy Control of Model Quantum Magnets
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 92(10)
Page(s) 104415 - 6
Title of proceedings Physical Review B
DOI 10.1103/physrevb.92.104415

Open Access

URL https://arxiv.org/abs/1510.00569
Type of Open Access Repository (Green Open Access)

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-neighbor and the third-nearest-neighbor spins can be determined unambiguously andwith equal precision as the dominating nearest-neighbor exchange coupling.
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