Abstract
Abstract We have synthesized Bi-2212 thin films of Bi 2 La x Ca 3− x Cu 2 O z with the composition range of 0.2≤ x ≤0.7 by the laser ablation method. Bi-2212 samples with the same range of composition have not been obtained by solid state reaction except the sample with x =0.5. The film with x =0.2 showed the highest starting temperature of diamagnetic signal ( T cm ) at about 78 K, and it changed from superconductor to insulator with increasing La content x .
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