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Magnetic excitation spectrum of LuFe2O4 measured with inelastic neutron scattering
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Gaw, S. M., Lewtas, H. J., McMorrow, D. F., Kulda, J., Ewings, R. A., Perring, T. G., McKinnon, R. A., Balakrishnan, Geetha, Prabhakaran, D. and Boothroyd, A. T. (2015) Magnetic excitation spectrum of LuFe2O4 measured with inelastic neutron scattering. Physical Review B (Condensed Matter and Materials Physics), Volume 91 (Number 3). Article number 035103 . doi:10.1103/PhysRevB.91.035103 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.91.035103
Abstract
We report neutron inelastic-scattering measurements and analysis of the spectrum of magnons propagating within the Fe2O4 bilayers of LuFe2O4. The observed spectrum is consistent with six magnetic modes and a single prominent gap, which is compatible with a single bilayer magnetic unit cell containing six spins. We model the magnon dispersion by linear spin-wave theory and find very good agreement with the domain-averaged spectrum of a spin-charge bilayer superstructure comprising one Fe3+-rich monolayer and one Fe2+-rich monolayer. These findings indicate the existence of polar bilayers in LuFe2O4. We also discuss a model of charge-segregated nonpolar bilayer order which we argue is not consistent with our data but which we cannot exclude definitively. Weak scattering observed below the magnon gap suggests that a fraction of the bilayers contain other combinations of charged monolayers not included in the model. Refined values for the dominant exchange interactions are reported.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 1098-0121 | ||||||
| Official Date: | 5 January 2015 | ||||||
| Dates: |
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| Volume: | Volume 91 | ||||||
| Number: | Number 3 | ||||||
| Article Number: | Article number 035103 | ||||||
| DOI: | 10.1103/PhysRevB.91.035103 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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