Magnon spectrum of the helimagnetic insulator Cu2OSeO3

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 (INS) 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 INS 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.

7 pages, 5 figures + Supplementary Information (added in version 2)

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• Spin dynamics in the pseudogap state of a high-temperature superconductor
• Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu2OSeO3
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• The quantum origins of skyrmions and half-skyrmions in Cu2OSeO3
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• Establishing the fundamental magnetic interactions in the chiral skyrmionic Mott insulator Cu2OSeO3 by terahertz electron spin resonance

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• Helical spin dynamics in Cu${}_2$OSeO${}_3$ as measured with small-angle neutron scattering
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