Infrared reflectivity of pure and doped CuGeO3

(2) Politecnico di Milano; (3) Universite De Paris-sud); A. Damascelli (1); A. Revcolevschi(3) ((1) University of Groningen; D. van der Marel (1); F. Parmigiani (2); G. Dhalenne (3)

arxiv: cond-mat/9707155 · v2 · submitted 1997-07-16 · ❄️ cond-mat.str-el

Infrared reflectivity of pure and doped CuGeO3

A. Damascelli (1) , D. van der Marel (1) , F. Parmigiani (2) , G. Dhalenne (3) , A. Revcolevschi(3) ((1) University of Groningen , (2) Politecnico di Milano , (3) Universite De Paris-sud) This is my paper

classification ❄️ cond-mat.str-el

keywords cugeo3temperaturedopedphasepurereflectivityspin-peierlsactivation

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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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Infrared reflectivity of pure and doped CuGeO3

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