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  Magnon spectrum of the helimagnetic insulator Cu2OSeO3

Portnichenko, P. Y., Romhányi, J., Onykiienko, Y. A., Henschel, A., Schmidt, M., Cameron, A. S., et al. (2016). Magnon spectrum of the helimagnetic insulator Cu2OSeO3. Nature Communications, 7: 10725, pp. 1-8. doi:10.1038/ncomms10725.

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Portnichenko, P. Y.1, Author
Romhányi, J.1, Author
Onykiienko, Y. A.1, Author
Henschel, A.2, Author              
Schmidt, M.3, Author              
Cameron, A. S.1, Author
Surmach, M. A.1, Author
Lim, J. A.1, Author
Park, J. T.1, Author
Schneidewind, A.1, Author
Abernathy, D. L.1, Author
Rosner, H.4, Author              
van den Brink, Jeroen1, Author
Inosov, D. S.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
3Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              
4Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 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 Cu-4 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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Language(s): eng - English
 Dates: 2016-02-25
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000371036100003
DOI: 10.1038/ncomms10725
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 7 Sequence Number: 10725 Start / End Page: 1 - 8 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723