Optical spectroscopy of pure and doped CuGeO3

Details Optical spectroscopy of pure and doped CuGeO3 Optical spectroscopy of pure and doped CuGeO3

1999-06-11

arxiv.org/abs/cond-mat/9906159v1

Phys. Rev. B 61, 12063 (2000).

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex, 18 pages, 22 postscript pictures embedded in the text, submitted to PRB. Find more stuff at http://www.stanford.edu/

Scientific paper

10.1103/PhysRevB.61.12063

We investigated in detail the optical properties of several Cu(1-delta)Mg(delta)GeO3 (with delta=0,0.01), and CuGe(1-x)B(x)O3 with B=Si (x=0,0.007,0.05,0.1), and Al (x=0,0.01) single crystals, in the frequency range 20-32000 cm^-1. We report temperature dependent reflectivity and transmission measurements, performed with polarized light in order to probe the anisotropy of the crystals along the b and c axes, and optical conductivity spectra obtained by Kramers-Kronig transformation or direct inversion of the Fresnel formula. Special emphasis is given to the far-infrared phonon spectra. The temperature dependence of the phonon parameters is presented and discussed in relation to the soft mode issue in CuGeO3. For T

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