Magnon spectrum of the helimagnetic insulator Cu2OSeO3

Nature Communications
P Y PortnichenkoD S Inosov

Abstract

Complex low-temperature-ordered states in chiral magnets are typically governed by a competition between multiple magnetic interactions. The chiral-lattice multiferroic Cu2OSeO3 became the first insulating helimagnetic material in which a long-range order of topologically stable spin vortices known as skyrmions was established. Here we employ state-of-the-art inelastic neutron scattering to comprehend the full three-dimensional spin-excitation spectrum of Cu2OSeO3 over a broad range of energies. Distinct types of high- and low-energy dispersive magnon modes separated by an extensive energy gap are observed in excellent agreement with the previously suggested microscopic theory based on a model of entangled Cu4 tetrahedra. The comparison of our neutron spectroscopy data with model spin-dynamical calculations based on these theoretical proposals enables an accurate quantitative verification of the fundamental magnetic interactions in Cu2OSeO3 that are essential for understanding its abundant low-temperature magnetically ordered phases.

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Citations

Dec 30, 2017·Physical Review Letters·Mathias WeilerSebastian T B Goennenwein
Feb 21, 2021·Proceedings of the National Academy of Sciences of the United States of America·N OgawaY Tokura
Sep 5, 2021·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Ibrahim Khan

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Methods Mentioned

BETA
inelastic neutron scattering
small-angle neutron-scattering
ESR
X-ray

Software Mentioned

ORACE
H ORACE
ATLAB

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