SPIN WAVES FROM POWDER DIFFRACTION

MnO spin-wave dispersion curves from powder diffraction
A L Goodwin, M T Dove, M G Tucker and D A Keen
Phys Rev B 75, 075423 (2007)

The final authors’ version of this article is available open access via. arXiv.org.

We describe a model-independent approach for the extraction of spin-wave dispersion curves from powder neutron total scattering data. Our approach is based on a statistical analysis of real-space spin configurations to calculate spin-dynamical quantities. The RMCPROFILE implementation of the reverse Monte Carlo refinement process is used to generate a large ensemble of supercell spin configurations from MnO powder diffraction data collected at 100 K. Our analysis of these configurations gives spin-wave dispersion curves for MnO that agree well with those determined independently using neutron triple-axis spectroscopic techniques.

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