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Anharmonic Magnon Excitations in Noncollinear and Charge-Ordered RbFe2+Fe3+F6

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 RbFe2+Fe3+F6. Physical Review Letters, 121 (8). ISSN 0031-9007. (doi:10.1103/PhysRevLett.121.087201)

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RbFe2+Fe3+F6 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 Fe2+ (S=2) and Fe3+ (S=5/2) moments form a noncollinear orthogonal structure with the Fe3+ site displaying a reduced static ordered moment. Neutron spectroscopy on single crystals finds two distinct spin wave branches with a dominant coupling along b-axis Fe3+ chain 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 non collinear magnet owing to the orthogonal spin arrangement.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevLett.121.087201
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Mark Green
Date Deposited: 29 Aug 2018 08:40 UTC
Last Modified: 12 Jul 2019 10:25 UTC
Resource URI: (The current URI for this page, for reference purposes)
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