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Spin excitations in the skyrmion host Cu2OSeO3

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Tucker G. S., White J. S., Romhányi J., Szaller D., Kézsmárki I., Roessli B., Stuhr U., Magrez A., Groitl F., Babkevich P., Huang P., Živković I., Rønnow H. M.,
Project Quantum Magnetism - Spinons, Skyrmions and Dipoles
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 93(5)
Page(s) 054401
Title of proceedings Physical Review B
DOI 10.1103/physrevb.93.054401

Open Access

URL https://infoscience.epfl.ch/record/217795
Type of Open Access Repository (Green Open Access)

Abstract

We have used inelastic neutron scattering to measure the magnetic excitation spectrum along the high-symmetry directions of the first Brillouin zone of the magnetic skyrmion hosting compound Cu2OSeO3. The majority of our scattering data are consistent with the expectations of a recently proposed model for the magnetic excitations in Cu2OSeO3, and we report best-fit parameters for the dominant exchange interactions. Important differences exist, however, between our experimental findings and the model expectations. These include the identification of two energy scales that likely arise due to neglected anisotropic interactions. This feature of our work suggests that anisotropy should be considered in future theoretical work aimed at the full microscopic understanding of the emergence of the skyrmion state in this material.
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