Abstract
We have studied the Ar annealing effect on T c of Y 0.85Ca 0.15Ba 2−xCu 3O y (x = 0.0, 0.5 and 1.0) samples, Ar annealing was carried out at 480°C for 15 min ∼ 10 h. As the annealing time increases, T c of the x = 0.0 and 0.5 samples first gradually increases to a maximum value, then it decreases slowly suggesting the assintered samples are in the over-doped state. However, the x = 1.0 sample shows an anomalous behavior. T c increases from 68 K to 75 K after Ar annealing for 15 ∼ 30 min, then it abruptly decreases to 40∼50 K after further Ar annealing.
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