Abstract
Superconducting thin films of Bi-Pb-Sr-Ca-Cu-O system were prepared on single crystal MgO(100) substrates by rf magnetron sputtering. The films deposited below 450°C were amorphous and insulating. These films were crystallized when annealed at temperature 830-850°C. The superconducting properties and phases were dependent on target compositions, substrate temperatures and annealing conditions. Impurity phases such as Ca2PbO4, (Ca, Sr)3Cu5Ox gave bad effects on the superconducting properties of the films. Films sputtered from Bi2.7Pb2Sr2Ca2Cu3.2O2 target at 400°C and post-annealed at 840°C for 3 hours in air showed Tc(R=0)=108K and Jc(77K, zero magnetic field)=7010A/cm2.
