As-grown superconducting thin films of Bi(Pb)-Sr-Ca-Cu-O by magnetron sputtering

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Abstract
As-grown superconducting thin films of Bi(Pb)-Sr-Ca-Cu-O have been prepared on MgO (100) at 620–740 °C by dc magnetron sputtering using a single target. The as-grown process followed by no special annealing yields c-axis oriented superconducting thin films with a smooth surface. Although the superconducting properties of the thin films are very sensitive to the substrate temperatures during film growth, reproducible results were obtained. The c-axis lattice constant of the films was also controlled to the values of about 24, 31, and 37 Å by changing the substrate temperature. The as-grown film deposited at 720 °C showed zero resistivity at 81 K and the critical current density increased from 8×104 A/cm2 at 77 K to 3×106 A/cm2 at 4.2 K.