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• W2069897307 abstract "Temperature-dependent positron-lifetime experiments have been performed from room temperature to 15 K on single crystals of the oxide superconductor ${mathrm{Ba}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{K}}_{mathit{x}}$${mathrm{BiO}}_{3mathrm{ensuremath{-}}mathit{y}}$. Results indicate that the filling of oxygen vacancies has a marked impact on the superconducting properties of this system. Cation defect concentrations were below the detectable limit of positron-annihilation-analysis techniques in this material, which is in sharp contrast to identical studies on polycrystalline samples. We find that the positron lifetime in these electrochemically deposited single crystals is determined by the oxygen stoichiometry of the lattice, but there is no experimental signature of strong positron localization. By performing a subsequent oxygen anneal on the crystals, the superconducting transition is sharpened and the onset is raised. The observed change in positron lifetime associated with this annealing procedure is in quantitative agreement with theory." @default.
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• W2069897307 date "1993-07-01" @default.
• W2069897307 modified "2023-09-27" @default.
• W2069897307 title "Correlation of the superconducting transition to oxygen stoichiometry in single-crystalBa1−xKxBiO3−y" @default.
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• W2069897307 doi "https://doi.org/10.1103/physrevb.48.611" @default.
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