Spin-phonon coupled modes in the incommensurate phases of doped CuGeO$_{3}$

Details Spin-phonon coupled modes in the incommensurate phases of doped CuGeO$_{3}$ Spin-phonon coupled modes in the incommensurate phases of doped CuGeO$_{3}$

2000-09-22

arxiv.org/abs/cond-mat/0009341v3

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 4 figures, resubmitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.63.245413

The doping effect of the folded phonon mode at 98 cm$^{-1}$ was investigated on the Si-doped CuGeO$_3$ 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 CuGeO$_3$. The splitting was observed in the incommensurate (IC) phase and the antiferromagnetically ordered incommensurate (IAF) phase above $H_C$. The split-off branches exhibit different field dependence from that of the pure CuGeO$_3$ in the vicinity of $H_C$, 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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