Dynamical Dzyaloshinsky-Moriya Interaction in KCuF3
M. V. Eremin, D. V. Zakharov, H.-A. Krug von Nidda, R. M. Eremina, A., Shuvaev, A. Pimenov, P. Ghigna, J. Deisenhofer, A. Loidl
TL;DR
This paper investigates the spin dynamics of KCuF3 using ESR spectroscopy, revealing a new dynamical Dzyaloshinsky-Moriya interaction caused by oscillations of bridging fluorine ions, resolving previous controversies.
Contribution
It introduces a novel dynamical form of Dzyaloshinsky-Moriya interaction linked to ion oscillations, advancing understanding of spin interactions in orbitally ordered perovskites.
Findings
Identification of a dynamical Dzyaloshinsky-Moriya interaction
Explanation of spin dynamics via fluorine ion oscillations
Resolution of magnetic and structural property controversies
Abstract
The spin dynamics of the prototypical quasi one-dimensional antiferromagnetic Heisenberg spin S=1/2 chain KCuF3 is investigated by electron spin resonance spectroscopy. Our analysis shows that the peculiarities of the spin dynamics require a new dynamical form of the antisymmetric anisotropic spin-spin interaction. This dynamical Dzyaloshinsky-Moriya interaction is related to strong oscillations of the bridging fuorine ions perpendicular to the crystallographic c axis. This new mechanism allows to resolve consistently the controversies in observation of the magnetic and structural properties of this orbitally ordered perovskite compound.
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