Neutron scattering measurements were performed on polycrystalline Y-Ba-Cu-O ceramics to explore the relationship between structure, phonon spectrum, and superconductivity. No evidence was seen for soft phonon modes. The superconducting transition temperature of the compound was tuned by heat treatments. Although oxygen removal leads to changes in the lattice parameters and the time-of-flight spectrum indicates a general softening of the lattice, the characteristic features in the phonon density of states remain unchanged.
ASJC Scopus subject areas
- Condensed Matter Physics