Physics – Condensed Matter – Materials Science
Scientific paper
2003-02-26
Physical Review B 67 (21): Art. No. 212403 JUN 1 2003
Physics
Condensed Matter
Materials Science
Accepted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.67.212403
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 $\Delta B$ (magnon excitations), with a $\Delta B_{max}$ 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 $\Delta B$ 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.
Dhalenne Guy
Krzystek J.
Revcolevschi Alexandre
van Loosdrecht Paul H. M.
Zvyagin Sergey A.
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