Optical phonons in the orthorhombic double-chainSr1−xCaxCuO2(x=0, 0.5)

Abstract
We report micro-Raman and far-infrared reflectivity spectra obtained from the two members SrCuO2 and Sr0.5 Ca0.5 CuO2 of the solid solution Sr1x Cax CuO2 with orthorhombic chain structure. The analysis of the spectra is based on the similarity between the investigated stucture and related copper oxides, which contain the same type of copper-oxygen chains. The assignment of the observed lines to atomic vibrations is supported by shell model lattice-dynamics calculations.

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