Establishing the fundamental magnetic interactions in the chiral Skyrmionic Mott insulator Cu2OSeO3 by terahertz electron spin resonance

M. Ozerov, J. Romhányi, M. Belesi, H. Berger, J. Ph Ansermet, Jeroen Van Den Brink, J. Wosnitza, S. A. Zvyagin, I. Rousochatzakis

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Abstract

The recent discovery of Skyrmions in Cu2OSeO3 has established a new platform to create and manipulate Skyrmionic spin textures. We use high-field electron spin resonance with a terahertz free-electron laser and pulsed magnetic fields up to 64 T to probe and quantify its microscopic spin-spin interactions. In addition to the previously observed long-wavelength Goldstone mode, this technique probes also the high-energy part of the excitation spectrum which is inaccessible by standard low-frequency electron spin resonance. Fitting the behavior of the observed modes in magnetic field to a theoretical framework establishes experimentally that the fundamental magnetic building blocks of this Skyrmionic magnet are rigid, highly entangled and weakly coupled tetrahedra.

Original languageEnglish (US)
Article number157205
JournalPhysical review letters
Volume113
Issue number15
DOIs
StatePublished - Oct 7 2014

Bibliographical note

Publisher Copyright:
© 2014 American Physical Society.

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