Abstract
Normal coordinate analysis of the optically active vibrations of doped lanthanum copper oxide (La2–xM x CuO4) has been made, with the assumption of an infinite [(CuO2)O2]6– layer model. On the basis of the results of this treatment, some of the observed bands so far reported have been successfully assigned to the Cu-O lattice vibrations. The force constants concerning Cu-O bonds have been obtained within the framework of a modified valence force field. It has been found that the present analysis based on the infinite layer model is useful for assigning the relatively high vibrational frequencies observed at the center (wave vector k = 0) of the first Brillouin zone in La2–xM x CuO4.
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