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024 7 _ |a 10.1103/PhysRevLett.117.017201
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100 1 _ |a Stock, C.
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245 _ _ |a Solitary Magnons in the S = 5/2 Antiferromagnet CaFe$_2$O$_4$
260 _ _ |a College Park, Md.
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520 _ _ |a 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.
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700 1 _ |a Rodriguez, E. E.
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700 1 _ |a Lee, N.
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700 1 _ |a Cheong, S.-W.
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773 _ _ |a 10.1103/PhysRevLett.117.017201
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