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Solitary Magnons in the S=5/2 Antiferromagnet CaFe2O4

Stock, C., Rodriguez, E. E., Lee, N., Green, M.A., Demmel, F., Ewings, R. A., Fouquet, P., Laver, M., Niedermayer, Ch., Su, Y., and others. (2016) Solitary Magnons in the S=5/2 Antiferromagnet CaFe2O4. Physical Review Letters, 117 (1). ISSN 0031-9007. (doi:10.1103/PhysRevLett.117.017201) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://doi.org/10.1103/PhysRevLett.117.017201

Abstract

CaFe2O4 is a S=52 anisotropic antiferromagnet based upon zig-zag chains having two competing magnetic structures, denoted as the A (????) and B (????) phases, which differ by the c-axis stacking of ferromagnetic stripes. We apply neutron scattering to demonstrate that the competing A and B phase order parameters result in magnetic antiphase boundaries along c which freeze on the time scale of ?1??ns at the onset of magnetic order at 200 K. Using high resolution neutron spectroscopy, we find quantized spin wave levels and measure 9 such excitations localized in regions ?1–2 c-axis lattice constants in size. We discuss these in the context of solitary magnons predicted to exist in anisotropic systems. The magnetic anisotropy affords both competing A+B orders as well as localization of spin excitations in a classical magnet.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevLett.117.017201
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Matthias Werner
Date Deposited: 26 Jan 2017 12:45 UTC
Last Modified: 29 May 2019 18:36 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/60104 (The current URI for this page, for reference purposes)
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