Far-Infrared Spectroscopy in Spin-Peierls Compound CuGeO_3 under High Magnetic Fields

Details Far-Infrared Spectroscopy in Spin-Peierls Compound CuGeO_3 under High Magnetic Fields Far-Infrared Spectroscopy in Spin-Peierls Compound CuGeO_3 under High Magnetic Fields

1999-05-21

arxiv.org/abs/cond-mat/9905325v2

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages multicolREVTeX, 10 figures

Scientific paper

10.1103/PhysRevB.62.5191

Polarized far-infrared (FIR) spectroscopic measurements and FIR magneto-optical studies were performed on the inorganic spin-Peierls compound CuGeO_3. An absorption line, which was found at 98 cm$^{-1}$ in the dimerized phase (D phase), was assigned to a folded phonon mode of B$_{3u}$ symmetry. The splitting of the folded mode into two components in the incommensurate phase (IC phase) has been observed for the first time. A new broad absorption centered at 63 cm$^{-1}$ was observed only in the ${\bf E}\parallel b$ axis polarization, which was assigned to a magnetic excitation from singlet ground state to a continuum state.

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