Abstract
The dispersion of Cu–O bond-stretching vibrations in overdoped La1.7Sr0.3CuO4
(not superconducting) has been studied by high-resolution inelastic
neutron scattering. It was found that the doping-induced renormalization
of the so-called breathing and half-breathing modes is larger than
in optimally doped La1.85Sr0.15CuO4. On the other hand, the phonon
linewidths are generally smaller in the overdoped sample. Features
observed in optimally doped La1.85Sr0.15CuO4 which suggest a tendency
towards charge stripe formation are absent in overdoped La1.7Sr0.3CuO4.
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