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

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

1997-09-29

arxiv.org/abs/cond-mat/9709312v2

Phys. Rev. B, 57 (1998) 5040

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.57.5040

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.

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