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We investigated annealing effect on the characteristics of Bi 2 Sr 2 CaCu 2 O y (Bi-2212) single crystals grown by a vertical Bridgman method. The oxygen contents of as grown single crystals were not optimal, and the superconductivity of the single crystals was improved by annealing in flowing oxygen. The maximum T c which was obtained by annealing at 600 ...
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