## Abstract

Electron-phonon coupling coefficients in BaPb_{1-x}Bi_{x}O_{3} are calculated microscopically on the basis of the tight-binding band model which utilizes energy band structures obtained with the use of the self-consistent LAPW method by Mattheiss and Hamann. Assuming the rigid-band model we calculate, as a function of Bi concentration x, the dimension-l less electron-phonon coupling constant λ in McMillan's strong-coupling theory of superconductor. We obtain large values of λ such as λ>1 for x>0.1. The origin of this large electron-phonon coupling is ascribed to: (i) the hybridization between 2pσ orbitals of 0 atoms and 6s orbitals of Pb or Bi atoms is large in the conduction band, (ii) this σ-bonding is strongly affected by a vibrational motion of 0 atoms in the direction connecting the 0 and Pb (Bi) atoms, and (iii) the mass of 0 atoms is light. We also evaluate superconducting transition temperature T_{c} as a function of x on the basis of the McMillan-Allen-Dynes equation. The results explain semi-quantitatively the observed x-dependence of T_{c}.

Original language | English |
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Pages (from-to) | 489-493 |

Number of pages | 5 |

Journal | Solid State Communications |

Volume | 60 |

Issue number | 6 |

DOIs | |

Publication status | Published - 1986 Jan 1 |

Externally published | Yes |

## ASJC Scopus subject areas

- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry

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