
The Library
Magnetic excitation spectrum of LuFe2O4 measured with inelastic neutron scattering
Tools
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.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
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: |
|
||||||
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 |
Request changes or add full text files to a record
Repository staff actions (login required)
![]() |
View Item |