Abstract
The lattice dynamical properties of BaPb1−x Bi x O3 are described within the polarizability model for perovskite oxides, but extended to take into account the valence instability of Bi. In a quantitative investigation it is found that a mode softening to a ferroelectric state is excluded, but a transition to a paired electron state is possible. The transformation of the classical Hamiltonian to its quantum-mechanical equivalent shows the parameter regimes for which pairing of electrons and thus possibly superconductivity occur.
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Bussman-Holder, A., Büttner, H., Simon, A. et al. Electron pairing mechanism in incipient ferroelectric BaPb1−x Bi x O3 . Z. Physik B - Condensed Matter 79, 445–449 (1990). https://doi.org/10.1007/BF01437656
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DOI: https://doi.org/10.1007/BF01437656