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| Home > Publications database > Solitary Magnons in the S = 5/2 Antiferromagnet CaFe$_2$O$_4$ |
| Journal Article | FZJ-2016-07345 |
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2016
APS
College Park, Md.
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Please use a persistent id in citations: http://hdl.handle.net/2128/13401 doi: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.
Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)
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