This title appears in the Scientific Report : 2016 

Magnon spectrum of the helimagnetic insulator Cu$_{2}$OSeO$_{3}$
Portnichenko, P. Y.
Romhányi, J. / Onykiienko, Y. A. / Henschel, A. / Schmidt, M. / Cameron, A. S. / Surmach, M. A. / Lim, J. A. / Park, J. T. / Schneidewind, A. / Abernathy, D. L. / Rosner, H. / van den Brink, Jeroen / Inosov, D. S. (Corresponding author)
Streumethoden; JCNS-2
Nature Communications, 7 (2016) S. 10725
London Nature Publishing Group 2016
Journal Article
Jülich Centre for Neutron Research (JCNS)
Please use the identifier: in citations.
Please use the identifier: in citations.
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.