Gaw, SM;
Lewtas, HJ;
McMorrow, DF;
Kulda, J;
Ewings, RA;
Perring, TG;
McKinnon, RA;
... Boothroyd, AT; + view all
(2015)
Magnetic excitation spectrum of LuFe2O4 measured with inelastic neutron scattering.
Physical Review B
, 91
(3)
, Article 035103. 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.
| Type: | Article |
|---|---|
| Title: | Magnetic excitation spectrum of LuFe2O4 measured with inelastic neutron scattering |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevB.91.035103 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevB.91.035103 |
| Language: | English |
| Additional information: | ©2015 American Physical Society |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1434306 |
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