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Title: Magnon spectrum of the helimagnetic insulator Cu2OSeO3

We report that 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.
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [3] ;  [3] ;  [3] ;  [5] ;  [6] ;  [7] ;  [4] ;  [8] ;  [3]
  1. Dresden Univ. of Technology (Germany). Institute of Solid State Physics
  2. Max Planck Institute for Solid State Research, Stuttgart (Germany)
  3. Dresden Univ. of Technology (Germany). Institute of Solid State Physics
  4. Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  5. Munich Univ. of Technology, Garching (Germany). Heinz Maier-Leibnitz Zentrum (MLZ)
  6. Heinz Maier-Leibnitz Zentrum (MLZ), Garching (Germany). Julich Centre for Neutron Science (JCNS)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  8. Leibniz Institute for Solid State and Materials Research, Dresden (Germany)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
IN 209/4-1
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States