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    Bulk Superconductivity at 60K in Oxygen-Deficient Ba sub 2 YCu sub 3 O sub (7-delta) and Oxygen Isotype Effect in La sub (1.65) Sr sub (0.15) CuO sub 4.

Bulk Superconductivity at 60K in Oxygen-Deficient Ba sub 2 YCu sub 3 O sub (7-delta) and Oxygen Isotype Effect in La sub (1.65) Sr sub (0.15) CuO sub 4.

01 January 1987

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Oxygen deficient polycrystalline samples of Ba sub 2 YCu sub 3 O sub (7-delta) have been prepared by a Zr-gettered annealing technique. A distinct bulk superconducting phase with a T sub c of 60K is found for 0.3