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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

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Official URL: http://dx.doi.org/10.1103/PhysRevB.91.035103

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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 > 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:
DateEvent
5 January 2015Published
28 June 2014Submitted
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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