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Purely local experimental probes of many copper oxide superconductors showthat their electronic states are inhomogeneous in real space. For example,scanning tunneling spectroscopic (STS) imaging shows strong variations in realspace, and according to nuclear quadrupole resonance (NQR) studies the chargedistribution in the bulk varies on the nanoscale. However, the analysis of theexperimental results utilizing spatially-averaged probes often ignores thisfact. We have performed a detailed investigation of the doping-dependence ofthe energy and line width and position of the zone-boundary Cu-Obond-stretching vibration in La_{2-x}Sr_xCuO_4 by inelastic neutron scattering.Both our new results as well as previously reported angle-dependent momentumwidths of the electronic spectral function detected by angle-resolvedphotoemission can be reproduced by including the same distribution of localenvironments extracted from the NQR analysis.

Effects of charge inhomogeneities on elementary excitations in La_{2-x}Sr_xCuO_4