Abstract
Thin films of BiSrCaCuO were prepared on MgO (100) by a single target sputtering. This deposition process yielded c-axis oriented superconducting thin films with a smooth surface. The as-grown films grown at 670–690°C showed 2223 single phase and zero resistivity at about 60 K. The as-grown films were directly placed on a Bi(Pb)SrCaCuO bulk sample, and then rapidly annealed at 835–845°C within 40 s in air. The superconducting properties of the annealed Bi(Pb)SrCaCuO films were greatly improved by optimizing the temperature and time during rapid annealing. Films annealed at 840°C for 30s in air showed zero resistivity at 100 K and had the critital current of about 1×106 A/cm 2 at 77 K. The surfaces of these films on MgO were black and smooth. The film quality is greatly improved by means of annealing process at 840°C for a very short time of 30 s in air after deposition.
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