TY  - JOUR
AU  - Portnichenko, P. Y.
AU  - Romhányi, J.
AU  - Onykiienko, Y. A.
AU  - Henschel, A.
AU  - Schmidt, M.
AU  - Cameron, A. S.
AU  - Surmach, M. A.
AU  - Lim, J. A.
AU  - Park, J. T.
AU  - Schneidewind, A.
AU  - Abernathy, D. L.
AU  - Rosner, H.
AU  - van den Brink, Jeroen
AU  - Inosov, D. S.
TI  - Magnon spectrum of the helimagnetic insulator Cu$_{2}$OSeO$_{3}$
JO  - Nature Communications
VL  - 7
SN  - 2041-1723
CY  - London
PB  - Nature Publishing Group
M1  - FZJ-2016-01780
SP  - 10725
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000371036100003
C6  - pmid:26911567
DO  - DOI:10.1038/ncomms10725
UR  - https://juser.fz-juelich.de/record/283357
ER  -