Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-07-16
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.
Damascelli Andrea
der Marel Dirk van
Dhalenne Guy
Parmigiani Francesca
Revcolevschi Alexandre
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