Magnon spectrum of the helimagnetic insulator Cu2OSeO3

Portnichenko, P. Y.; Romhányi, J.; Onykiienko, Y. A.; Henschel, A.; Schmidt, M.; Cameron, A. S.; Surmach, M. A.; Lim, J. A.; Park, J. T.; Schneidewind, A.; Abernathy, D. L.; Rosner, H.; van den Brink, Jeroen; Inosov, D. S.

doi:10.1038/ncomms10725

Title: Magnon spectrum of the helimagnetic insulator Cu₂OSeO₃

Journal Article · Thu Feb 25 00:00:00 EST 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms10725· OSTI ID:1259669

Portnichenko, P. Y. ^[1]; Romhányi, J. ^[2]; Onykiienko, Y. A. ^[3]; Henschel, A. ^[4]; Schmidt, M. ^[4]; Cameron, A. S. ^[3]; Surmach, M. A. ^[3]; Lim, J. A. ^[3]; Park, J. T. ^[5]; Schneidewind, A. ^[6]; Abernathy, D. L. ^[7]; Rosner, H. ^[4]; van den Brink, Jeroen ^[8]; Inosov, D. S. ^[3]

Dresden Univ. of Technology (Germany). Institute of Solid State Physics
Max Planck Institute for Solid State Research, Stuttgart (Germany)
Dresden Univ. of Technology (Germany). Institute of Solid State Physics
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Munich Univ. of Technology, Garching (Germany). Heinz Maier-Leibnitz Zentrum (MLZ)
Heinz Maier-Leibnitz Zentrum (MLZ), Garching (Germany). Julich Centre for Neutron Science (JCNS)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Leibniz Institute for Solid State and Materials Research, Dresden (Germany)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: IN 209/4-1; AC05-00OR22725

OSTI ID:: 1259669

Alternate ID(s):: OSTI ID: 1267047

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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Title: Magnon spectrum of the helimagnetic insulator Cu₂OSeO₃