EFFECT OF PB DOPING ON 2223 BISRCACUO SUPERCONDUCTING THIN-FILMS USING A RAPID ANNEALING PROCESS

As-grown superconducting thin films of 2223 Bi(Pb)SrCaCuO have first b een prepared on MgO(100) substrates by DC magnetron sputtering from a single sintered target. The as-grown films showed zero resistivity at about 83 K. After the film deposition, the films were rapidly annealed at 840-degrees-C for 30 s in air in order to improve the superconduct ing properties. During annealing, a bulk BiPbSrCaCuO sample was placed on the film surface. In order to examine the effect of Pb doping, we prepared five sorts of bulk sintered samples of Bi2PbxSr2Ca2Cu3Oy (x = 0, 0.1, 0.35, 0.5 and 0.7) with different Pb contents. The supercondu cting properties of the thin films were affected by the Pb content of the covering bulks. An x-ray photoelectron spectroscopy measurement wa s carried out to study the change of chemical environment for each ion . The nature of the chemical bond of each element in the films seems t o be unchanged by the Pb doping, except for the Pb. The best film show ed zero resistivity at 105 K and had a critical current density of abo ut 2 x 10(6) A cm-2 at 77 K.