Abstract
Abstract Microscopic theory of electron-lattice interaction and lattice dynamics of BaPb1−x Bi x O3 is 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 super-conductivity of this compound the spectral function α2 F(ω) and the dimensionless electron-phonon coupling constant λ are calculated. The large renormalization of the longitudinal oxygen stretching mode causes significant enhancement of λ as well as remarkable modification of the shape of α2 F(ω). A high superconducting transition temperature such as Tc ∼ 10 K is expected.
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