The high-frequency oxygen vibrations in superconducting Ba 0.6 K 0.4 BiO 3 have been studied by inelastic neutron scattering. The results give evidence that the Coulomb forces between the ions are screened only imperfectly. The highest LO branches associated with the Bi-O bond stretching vibrations exhibit an anomalous shape with a particularly pronounced frequency renormalization of the one-dimensional breathing mode. The dispersion resembles that of corresponding branches in the cuprate superconductors.
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Braden et al. (1996) studied this question.
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