Occurrence of superconductivity in Ca-doped (Pb,Cu)Sr2PrCu2Oz

초록

We have investigated the Ca-doping effects on the structural, electrical and magnetic properties of (Pb0.5Cu0.5)Sr-2(Pr1-xCa)Cu2Oz(x = 0 - 0.5) bulk ceramic samples. The electrical resistivity, thermoelectric power and magnetic susceptibility measurements reveal that the Ca doping introduces holes into the system and thereby superconductivity with onset T-c of about 36 K is induced for a phase with x = 0.5. These results are discussed in conjunction with the roles of hole doping, structural changes and Pr-O hybridization in CuO2 layers.

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