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

Abstract

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 $\mathbf{E}\parallel b$ axis polarization, which was assigned to a magnetic excitation from singlet ground state to a continuum state.

9 pages multicolREVTeX, 10 figures

References in corpus (6)

• Double gap and solitonic excitations in the spin-Peierls chain CuGeO3
• Dynamics of the Peierls-active phonon modes in CuGeO_3
• NMR imaging of the soliton lattice profile in the spin-Peierls compound CuGeO_3
• Neutron scattering study of the field-induced soliton lattice in CuGeO${}_3$
• Infrared signatures of the spin-Peierls transition in CuGeO3
• Folded modes in the infrared spectra of the spin-Peierls phase of CuGeO_3

Cited by in corpus (4)

• Theory of phonon-assisted "forbidden" optical transitions in spin-gapped systems
• Spin-phonon coupled modes in the incommensurate phases of doped CuGeO${}_3$
• Pulsed Magnetophononics in Gapped Quantum Magnets
• Phonon spectrum in the spin-Peierls phase of CuGeO${}_3$