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Anharmonic Magnon Excitations in Noncollinear and Charge-Ordered \(RbFe^{2+}Fe^{3+}F_6\)

Songvilay, M., Rodriguez, E. E., Lindsay, R., Green, M. A, Walker, H. C., Rodriguez-Rivera, J. A., Stock, C. (2018) Anharmonic Magnon Excitations in Noncollinear and Charge-Ordered \(RbFe^{2+}Fe^{3+}F_6\). Physical Review Letters, 121 (8). Article Number 087201. ISSN 0031-9007. (doi:10.1103/PhysRevLett.121.087201) (KAR id:68846)

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https://doi.org/10.1103/PhysRevLett.121.087201

Abstract

\(RbFe^{2+}Fe^{3+}F_6\) is an example of a charge ordered antiferromagnet where iron sites, with differing valences, are structurally separated into two interpenetrating sublattices. The low temperature magnetically ordered \(Fe^{2+}\) (S=2) and \(Fe^{3+}\) (S=5/2) moments form a noncollinear orthogonal structure with the \(Fe^{3+}\) site displaying a reduced static ordered moment. Neutron spectroscopy on single crystals finds two distinct spin wave branches with a dominant coupling along the \(Fe^{3+}\) chain axis (b axis). High resolution spectroscopic measurements find an intense energy and momentum broadened magnetic band of scattering bracketing a momentum-energy region where two magnon processes are kinematically allowed. These anharmonic excitations are enhanced in this noncollinear magnet owing to the orthogonal spin arrangement.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevLett.121.087201
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: Mark Green
Date Deposited: 29 Aug 2018 08:40 UTC
Last Modified: 16 Feb 2021 13:57 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/68846 (The current URI for this page, for reference purposes)
Green, M. A: https://orcid.org/0000-0002-7886-6205
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