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Condensed Matter Theories pp 253–268Cite as

Superconductivity in Ba1-XKxBiO3 Cubic Oxides

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Part of the book series: Condensed Matter Theories ((COMT,volume 7))

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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Author notes

  1. M. H. Degani

    Present address: Instituto de Física e Química de São Carlos-USP, São Carlos, Brazil

Authors and Affiliations

  1. Concurrent Computing Laboratory for Materials Simulations and Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana, 70803-4001, USA

    M. H. Degani, Wei Jin, Rajiv K. Kalia & Priya Vashishta

  2. Intense Pulsed Neutron Source Argonne National Laboratory, Argonne, Illinois, 60439-4814, USA

    C.-K Loong

Authors
  1. M. H. Degani
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  2. Wei Jin
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  3. Rajiv K. Kalia
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  4. Priya Vashishta
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  5. C.-K Loong
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Editor information

Editors and Affiliations

  1. University of Buenos Aires, Vicente López, Argentina

    Araceli Noemi Proto  & Jorge Luis Aliaga  & 

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Degani, M.H., Jin, W., Kalia, R.K., Vashishta, P., Loong, CK. (1992). Superconductivity in Ba1-XKxBiO3 Cubic Oxides. In: Proto, A.N., Aliaga, J.L. (eds) Condensed Matter Theories. Condensed Matter Theories, vol 7. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3352-8_24

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  • DOI: https://doi.org/10.1007/978-1-4615-3352-8_24

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4613-6478-8

  • Online ISBN: 978-1-4615-3352-8

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