Abstract
Within the polaron theory of superconductivity for La 2−x Sr x CuO 4 and La 2−x Ba x CuO 4 the coupling is considered between the charge carriers and both the stretching mode of the apical oxygens and the sheet-bending mode of the basal-plane oxygens, the latter via the tilting angle of the Cu-oxygen octahedra. The same tilting angle enters the coupling strengths of these lattice vibrations, leading to renormalized frequencies and their oxygen-isotope shifts. It is suggested that the anomalies occurring in the superconducting critical temperature, its isotope shift and the isotope shifts of the lattice frequencies around x=0.12 are related to the orthorhombic-tetragonal transition of these compounds.
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