Abstract
The Bi-Pb-Sr-Ca-Cu-O superconductive polycrystal films were prepared by the two-step-annealing of the deposited film on a MgO substrate. Of these films, the low (Bi+Pb) content films showed the highest sensitivity to magnetic fields. On the contrary, the high (Bi+Pb) content films showed the lowest sensitivity. The high sensitivity films indicated the bad c-axis orientation of the grains, but the low sensitivity films indicated the good c-axis orientation. The c-axis length for both of the high T c phase and the low T c phase was separated into two parts. The c-axis of the high T c phase for the high sensitivity films was about 0.01 nm shorter than those for the low sensitivity films. It is postulated that this change of the c-axis length was caused by the increase of d-space in the Bi-O double layer.
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