Folded modes in the infrared spectra of the spin-Peierls phase of CuGeO_3

Abstract

Polarized far-infrared transmittance spectra of CuGeO_3 single crystals were measured at different temperatures (6K < T < 300K). Two spectral lines, at 284.2 cm-1 in E||c polarization and at 311.7 cm-1 in E||b polarization, appear at the temperature of the spin-Peierls transition and grow in intensity with decreasing temperature. Both of them are, most probably, folded modes of the dimerized lattice. We discuss a possible role of the spin-phonon interaction in the formation of the 311.7 cm-1 feature.

4 pages, 5 figures, 1 table; Submitted to Phys.Rev.B Second revision. Figures and text were slightly changed

References in corpus (1)

• Appearance of new lines and change in line shape in the IR spectrum of a NaV_2O_5 single crystal at the spin-Peierls transition

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• Far-Infrared Spectroscopy in Spin-Peierls Compound CuGeO_3 under High Magnetic Fields
• Optical spectroscopy of pure and doped CuGeO3
• Lattice dynamics and electronic transitions in a structurally-complex layered copper borate Cu${}_3$(BO${}_3$)${}_2$
• Spin-phonon coupled modes in the incommensurate phases of doped CuGeO${}_3$
• Phonon spectrum in the spin-Peierls phase of CuGeO${}_3$