Abstract
Superconductivity in Ba1-XKXBiO3 is investigated within the framework of Eliashberg theory using a model of the Eliashberg function, α2F(ω). The phonon density of states (DOS) in Bal-XKXBiO3 is studied using inelastic neutron scattering and molecular-dynamics (MD) simulations. The model of α2F(ω) is based upon the MD phonon density of states. The function α (ω) is constructed using information from electron tunneling experiments, with the premise that the electron-phonon coupling constant λ≈ 1 and that strong electron-phonon coupling exists for high energy (30–60 meV) phonon modes. From a study of the reference oxygen isotope-effect exponent in the phonon DOS, the oxygen isotope-effect exponent in Tc, 2∆/kBTc, and electron tunneling spectra, we conclude that Ba1-XKXBiO3 is a weak to moderate coupling BCS superconductor. The coupling of electrons to high energy oxygen phonons provide a reasonable description of superconductivity in this material within the framework of the Eliashberg theory.
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