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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
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000824843 520__ $$aCaFe2O4 is a S=52 anisotropic antiferromagnet based upon zig-zag chains having two competing magnetic structures, denoted as the A (↑↑↓↓) and B (↑↓↑↓) phases, which differ by the c-axis stacking of ferromagnetic stripes. We apply neutron scattering to demonstrate that the competing A and B phase order parameters result in magnetic antiphase boundaries along c which freeze on the time scale of ∼1  ns at the onset of magnetic order at 200 K. Using high resolution neutron spectroscopy, we find quantized spin wave levels and measure 9 such excitations localized in regions ∼1–2 c-axis lattice constants in size. We discuss these in the context of solitary magnons predicted to exist in anisotropic systems. The magnetic anisotropy affords both competing A+B orders as well as localization of spin excitations in a classical magnet.
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000824843 7001_ $$0P:(DE-HGF)0$$aRodriguez, E. E.$$b1
000824843 7001_ $$0P:(DE-HGF)0$$aLee, N.$$b2
000824843 7001_ $$0P:(DE-HGF)0$$aGreen, M. A.$$b3
000824843 7001_ $$0P:(DE-HGF)0$$aDemmel, F.$$b4
000824843 7001_ $$0P:(DE-HGF)0$$aEwings, R. A.$$b5
000824843 7001_ $$0P:(DE-HGF)0$$aFouquet, P.$$b6
000824843 7001_ $$0P:(DE-HGF)0$$aLaver, M.$$b7
000824843 7001_ $$0P:(DE-HGF)0$$aNiedermayer, Ch.$$b8
000824843 7001_ $$0P:(DE-Juel1)130991$$aSu, Y.$$b9$$ufzj
000824843 7001_ $$0P:(DE-Juel1)141702$$aNemkovskiy, Kirill$$b10$$ufzj
000824843 7001_ $$0P:(DE-HGF)0$$aRodriguez-Rivera, J. A.$$b11
000824843 7001_ $$0P:(DE-HGF)0$$aCheong, S.-W.$$b12
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