%0 Journal Article
%A Portnichenko, P. Y.
%A Romhányi, J.
%A Onykiienko, Y. A.
%A Henschel, A.
%A Schmidt, M.
%A Cameron, A. S.
%A Surmach, M. A.
%A Lim, J. A.
%A Park, J. T.
%A Schneidewind, A.
%A Abernathy, D. L.
%A Rosner, H.
%A van den Brink, Jeroen
%A Inosov, D. S.
%T Magnon spectrum of the helimagnetic insulator Cu$_{2}$OSeO$_{3}$
%J Nature Communications
%V 7
%@ 2041-1723
%C London
%I Nature Publishing Group
%M FZJ-2016-01780
%P 10725
%D 2016
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000371036100003
%$ pmid:26911567
%R 10.1038/ncomms10725
%U https://juser.fz-juelich.de/record/283357