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Effects of Oxygen-Potential-Controlled Annealing on the Superconducting Properties of (Bi, Pb)2Sr2Ca2Cu3Oy Thin Films

The oxygen potential of thin films consisting of monophasic (Bi, Pb)2Sr2Ca2Cu3Oy was controlled by annealing them under various oxygen partial pressures. The Tc of (Bi, Pb)2Sr2Ca2Cu3Oy was found to decrease monotonously with decreasing oxygen potential. However, Tc did not change when annealed under higher oxygen pressure up to 2.9×104 torr. The carrier concentration was found to change with oxygen partial pressure, implying that oxygen supplies the carrier. An optimum range of the carrier concentration exists for attaining the highest Tc. This finding is consistent with those of other high Tc hole-type superconductors.