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Article

ВЛИЯНИЕ КИСЛОРОДНЫХ ВАКАНСИЙ В Sro-ПЛОСКОСТЯХ НА Тc(X)-ЗАВИСИМОСТЬ КРИСТАЛЛОВ BI2SR2–XLAXCUO6+δ

Неорганические материалы. 2019. Т. 55. № 12. С. 1319-1326.
Кулаков А. Б., Шовкун Д. В., Трунин М. Р.

We report the first systematic study of the effect of oxidizing annealing on the superconducting transition temperature Tc of Bi2Sr2 – xLaxCuO6 + δ crystals. Using a standard heat treatment procedure, we have obtained detailed Tc(x) data for Bi2Sr2 – xLaxCuO6 + δ crystals in the range x = 0.35–0.75. Comparison of the shape of the Tc(x) curve for Bi2Sr2 – xLaxCuO6 + δ with that for La2 – xSrxCuO4 demonstrates a factor of 4 reduction in the dependence of hole concentration in the CuO2 planes from a La3+ substitution on the Sr2+ sites becouse oxygen content (or index) varies. This finding can be accounted for in terms of changes in the amount of oxygen vacancies in the SrO planes. In particular, the oxygen index in Bi2Sr2 – xLaxCuO6 + δ varies by 0.3 per formula unit.