Magnon spectrum of the helimagnetic insulator Cu2OSeO3
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
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.
Details
Originalsprache | Englisch |
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Aufsatznummer | 10725 |
Seitenumfang | 8 |
Fachzeitschrift | Nature communications |
Jahrgang | 7 |
Publikationsstatus | Veröffentlicht - Feb. 2016 |
Peer-Review-Status | Ja |
Externe IDs
Scopus | 84959449114 |
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Schlagworte
Schlagwörter
- MAGNETIC EXCITATIONS, SKYRMIONS, DYNAMICS, STATE, PHASE