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28 March 2024 |
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Magnon spectrum of the helimagnetic insulator Cu2OSeO3 | P. Y. Portnichenko
; J. Romhanyi
; Y. A. Onykiienko
; A. Henschel
; M. Schmidt
; A. S. Cameron
; M. A. Surmach
; J. A. Lim
; J. T. Park
; A. Schneidewind
; D. L. Abernathy
; H. Rosner
; Jeroen van den Brink
; D. S. Inosov
; | Date: |
8 Sep 2015 | 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. | Source: | arXiv, 1509.2432 | Services: | Forum | Review | PDF | Favorites |
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