Journal Article

FZJ-2016-01780

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnon spectrum of the helimagnetic insulator Cu$_{2}$OSeO$_{3}$

Portnichenko, P. Y. ; Romhányi, J. ; Onykiienko, Y. A. ; Henschel, A. ; Schmidt, M.Extern* ; Cameron, A. S. ; Surmach, M. A. ; Lim, J. A. ; Park, J. T. ; Schneidewind, A. ; Abernathy, D. L. ; Rosner, H. ; van den Brink, J. ; Inosov, D. S. (Corresponding author)

2016
Nature Publishing Group London

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Please use a persistent id in citations: http://hdl.handle.net/2128/9917  doi:10.1038/ncomms10725

Abstract: 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.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Streumethoden (JCNS-2)

Research Program(s):

1. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. PANDA: Cold three axes spectrometer (SR2)
2. PUMA: Thermal three axes spectrometer (SR7)

Appears in the scientific report 2016

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