Microscopic theory of electron-lattice interaction and lattice dynamics of BaPb1-xBixO3is developed on the basis of the realistic electronic band structure. Owing to a strong electron-lattice interaction, a remarkable frequency renormalization and a large linewidth are found for only the longitudinal oxygen stretching mode and their magnitude increases with increasing Bi concentration. To discuss the superconductivity of this compound the spectral function α2F(ω) and the dimensionless electron-phonon coupling constant X are calculated. The large renormalization of the longitudinal oxygen stretching mode causes significant enhancement of X as well as remarkable modification of the shape of α2F(ω). A high superconducting transition temperature such as Tc~ 10 K is expected.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics