Abstract
Temperature-dependent frequency-shift and linewidth data of the Raman active 337-${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ ${\mathrm{CuO}}_{2}$ in-plane bond-bending mode have been measured for five different oxygen stoichiometries between x=7.00 and x=6.14 in polycrystalline samples. Softening and line-broadening effects observed for the x=7.00 sample are sharply reduced for x=6.87 even though the superconducting transition temperature is similar. With a further reduction of oxygen content below x=6.68 both the soft-mode behavior and the line-broadening effects completely disappear. These unexpected results could suggest a large variation in the interaction between the electronic system and the lattice as the oxygen content is varied.
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