Effect of Oxygen Content on the Electrical Transport and Superconducting Properties of Pb0.5Sr2.5Y0.6Ca0.4Cu2O7—y

Two kinds of methods have been used to synthesize Pb 0.5 Sr 2.5 Y 0.6 Ca 0.4 Cu 2 O 7-y samples. The synthesized sample using the first method shows superconductivity, while that using the second method exhibits a localized behavior at low temperature. Thermogravimetric analysis (TGA) and electrical transport measurements have been carried out on superconducting and nonsuperconducting samples grown under the two kinds of synthesis conditions anti the effect of oxygen content on the transport and superconducting propertics is discussed briefly.