Abstract
An inelastic-neutron-scattering study performed on a single crystal of superconducting ${\mathrm{La}}_{1.85}$${\mathrm{Sr}}_{0.15}$Cu${\mathrm{O}}_{4}$ reveals that the highest longitudinal phonon mode at wave vector ($\ensuremath{\pi}, 0$) (planar oxygen bond-stretching mode), of which the frequency is strongly affected by hole doping, has a very wide and asymmetric line shape. This line shape is considered anomalous and cannot be explained by normal electron-phonon coupling (Fermi surface nesting) or a macroscopic inhomogeneous hole distribution.
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