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100 1 _ |a Portnichenko, P. Y.
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245 _ _ |a Magnon spectrum of the helimagnetic insulator Cu$_{2}$OSeO$_{3}$
260 _ _ |a London
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520 _ _ |a Complex low-temperature-ordered states in chiral magnets are typically governed by acompetition between multiple magnetic interactions. The chiral-lattice multiferroic Cu2OSeO3became the first insulating helimagnetic material in which a long-range order of topologicallystable spin vortices known as skyrmions was established. Here we employ state-of-the-artinelastic neutron scattering to comprehend the full three-dimensional spin-excitation spectrumof Cu2OSeO3 over a broad range of energies. Distinct types of high- and low-energydispersive magnon modes separated by an extensive energy gap are observed in excellentagreement with the previously suggested microscopic theory based on a model of entangledCu4 tetrahedra. The comparison of our neutron spectroscopy data with model spin-dynamicalcalculations based on these theoretical proposals enables an accurate quantitative verificationof the fundamental magnetic interactions in Cu2OSeO3 that are essential for understandingits abundant low-temperature magnetically ordered phases.
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650 1 7 |a Magnetic Materials
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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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700 1 _ |a Romhányi, J.
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700 1 _ |a Onykiienko, Y. A.
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700 1 _ |a Henschel, A.
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700 1 _ |a Schmidt, M.
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700 1 _ |a Cameron, A. S.
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700 1 _ |a Surmach, M. A.
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700 1 _ |a Lim, J. A.
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700 1 _ |a Park, J. T.
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700 1 _ |a Schneidewind, A.
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700 1 _ |a Abernathy, D. L.
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700 1 _ |a Rosner, H.
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700 1 _ |a van den Brink, Jeroen
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700 1 _ |a Inosov, D. S.
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773 _ _ |a 10.1038/ncomms10725
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