The dimerized-incommensurate phase transition in the spin-Peierls compound CuGeO3 is probed using multifrequency high-resolution electron spin resonance (ESR) technique, in magnetic fields up to 17 T. A field-induced development of the soliton-like incommensurate superstructure is clearly indicated as a pronounced increase of the ESR linewidth ΔB (magnon excitations), with a ΔBmax at Bc∼ 13.8 T. The anomaly is explained in terms of the magnon-soliton scattering, and suggests that the soliton-like phase exists close to the boundary of the dimerized-incommensurate phase transition. In addition, magnetic excitation spectra in 0.8% Si-doped CuGeO3 are studied. Suppression of the ΔB anomaly observed in the doped samples suggests a collapse of the long-range-ordered soliton states upon doping, that is consistent with high-field neutron scattering experiments.
@article{arxiv.cond-mat/0302542,
title = {Field-induced structural evolution in the spin-Peierls compound CuGeO$_3$: high-field ESR study},
author = {S. A. Zvyagin and J. Krzystek and P. H. M. van Loosdrecht and G. Dhalenne and A. Revcolevschi},
journal= {arXiv preprint arXiv:cond-mat/0302542},
year = {2016}
}