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Field-induced structural evolution in the spin-Peierls compound CuGeO$_3$: high-field ESR study

S. A. Zvyagin·J. Krzystek·P. H. M. van Loosdrecht·G. Dhalenne·A. Revcolevschi
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Abstract

The dimerized-incommensurate phase transition in the spin-Peierls compound CuGeO$_3$ 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 $ΔB_{max}$ at $B_{c}\sim$ 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 CuGeO$_3$ 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.

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S. A. Zvyagin, J. Krzystek, P. H. M. van Loosdrecht, G. Dhalenne, A. Revcolevschi. 2003-06-12. Field-induced structural evolution in the spin-Peierls compound CuGeO$_3$: high-field ESR study. https://doi.org/10.1103/physrevb.67.212403

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