Abstract-Establishing the fundamental magnetic interactions in the chiral skyrmionic Mott insulator Cu2OSeO3 by terahertz electron spin resonance

https://scirate.com/arxiv/1404.7319

• M. Ozerov,
 
• J. Romhányi,
 
• M. Belesi,
 
• H. Berger,
 
• J.-Ph. Ansermet,
 
• Jeroen van den Brink,
 
• J. Wosnitza,
 
• S. A. Zvyagin,
 
• I. Rousochatzakis
• 
  

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 (ESR) spectroscopy combining a terahertz free electron laser and pulsed magnetic fields up to 64 T to probe and quantify its microscopic spin-spin interactions. Besides providing direct access to the long-wavelength Goldstone mode, this technique probes also the high-energy part of the excitation spectrum which is inaccessible by standard low-frequency ESR. 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.