Recent theoretical calculations have suggested the coupling of electrons to high-energy oxygen phonons as an explanation of superconductivity in the Ba1−x K x BiO3−y system. We have synthesized high-quality single crystals of the material and have examined the behaviors of critical field and critical current parameters as a function of changes in the oxygen content and in the Ba/K ratio. We have determined, via positron lifetime spectroscopy and singlecrystal X-ray measurements, that the oxygen stoichiometry in this system can be varied without significant impact on the metal atom sublattice. These results facilitate an investigation of the dependence of critical parameters on dopant and defect levels in this system.
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Mosley, W.D., Lan, M.D., Sterne, P.A. et al. Correlation of magnetic properties to oxygen and potassium stoichiometry in single-crystal Ba1−x K x BiO3−y . J Supercond 7, 299–301 (1994). https://doi.org/10.1007/BF00724557
- Ba1−x K x BiO3−y