000824843 001__ 824843 000824843 005__ 20210129225133.0 000824843 0247_ $$2doi$$a10.1103/PhysRevLett.117.017201 000824843 0247_ $$2ISSN$$a0031-9007 000824843 0247_ $$2ISSN$$a1079-7114 000824843 0247_ $$2ISSN$$a1092-0145 000824843 0247_ $$2Handle$$a2128/13401 000824843 0247_ $$2WOS$$aWOS:000378878700007 000824843 0247_ $$2altmetric$$aaltmetric:8748362 000824843 0247_ $$2pmid$$apmid:27419585 000824843 037__ $$aFZJ-2016-07345 000824843 082__ $$a550 000824843 1001_ $$0P:(DE-HGF)0$$aStock, C.$$b0$$eCorresponding author 000824843 245__ $$aSolitary Magnons in the S = 5/2 Antiferromagnet CaFe$_2$O$_4$ 000824843 260__ $$aCollege Park, Md.$$bAPS$$c2016 000824843 3367_ $$2DRIVER$$aarticle 000824843 3367_ $$2DataCite$$aOutput Types/Journal article 000824843 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1484030937_19272 000824843 3367_ $$2BibTeX$$aARTICLE 000824843 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000824843 3367_ $$00$$2EndNote$$aJournal Article 000824843 520__ $$aCaFe2O4 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. 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