Spin-phonon coupled modes in the incommensurate phases of doped CuGeO3
Abstract
The doping effect of the folded phonon mode at 98 cm-1 was investigated on the Si-doped CuGeO3 by magneto-optical measurements in far-infrared (FIR) region under high magnetic field. The folded phonon mode at 98 cm-1 appears not only in the dimerized (D) phase but also in the dimerized-anitiferromagnetic (DAF) phase on the doped CuGeO3. The splitting was observed in the incommensurate (IC) phase and the antiferromagnetically ordered incommensurate (IAF) phase above HC. The split-off branches exhibit different field dependence from that of the pure CuGeO3 in the vicinity of HC, and the discrepancy in the IAF phase is larger than that in the IC phase. It is caused by the interaction between the solitons and the impurities.
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