Infrared reflectivity of pure and doped CuGeO3

Details Infrared reflectivity of pure and doped CuGeO3 Infrared reflectivity of pure and doped CuGeO3

1997-07-16

arxiv.org/abs/cond-mat/9707155v2

Physica B 244 (1998) 114-120

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex, 10 pages, 8 postscript pictures, Physica B, in press (1997)

Scientific paper

10.1016/S0921-4526(97)00472-9

We investigated the far- and mid-infrared reflectivity (20-6000 wavenumber) of several pure and doped CuGeO3 single crystals. The b-axis and c-axis optical response is presented for different temperatures between 4 K and 300 K. Moreover, a full group theoretical analysis of the lattice vibrational modes of CuGeO3 in the high temperature undistorted phase as well as in the low temperature spin-Peierls phase is reported and compared to the experimental results. We observe the activation of zone boundary phonons along the b axis of the crystal below the spin-Peierls transition temperature.

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