Abstract
We report about systematic studies on the phonon spectra of 123 superconductors by means of inelastic neutron scattering using polycrystalline samples. We did not observe any unusual dependence on the temperature, in particular no changes were found when passing through the superconducting transition temperature. In contrast, very pronounced changes in the phonon spectra occur when superconductivity is destroyed by the removal of O or a partial replacement of Cu by Zn. Using small single crystals of YBa 2Cu 3O 7−δ we investigated the phonon dispersion curve up to energies ≈40 meV. The results were used to adjust the parameters of a lattice dynamical model.
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