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 been 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 superconducting 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 superconducting properties of the thin films were affected by the Pb content of the covering bulks. An x-ray photoelectron spectroscopy measurement was 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 to be unchanged by the Pb doping, except for the Pb. The best film showed zero resistivity at 105 K and had a critical current density of about 2 x 10(6) A cm-2 at 77 K.