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28 March 2024
 
  » arxiv » 1509.2432

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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
AbstractComplex 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
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