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For as-grown samples, the antiferromagnetic order was fully suppressed in the range region x \\geq 0.15, and weak superconductivity appeared when x \\geq 0.1. Beginning at x = 0.5, weak superconductivity was found to evolve into bulk superconductivity. Interestingly, for O2-annealed samples, complete suppression of magnetic order and the occurrence of bulk superconductivity were observed when x \\geq 0.1. 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