Superconductivity in Bi-2212 thin films of Bi2LaxCa3-xCu2Oz prepared by laser ablation method

We have synthesized Bi-2212 thin films of Bi2LaxCa3-xCu2Oz with the composi tion range of 0.2 less than or equal to x less than or equal to 0.7 by the laser ablation method. Bi-2212 samples with the same range of composition h ave 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 diamagn etic signal (T-cm) at about 78 K, and it changed from superconductor to ins ulator with increasing La content x. (C) 1999 Elsevier Science B.V. All rig hts reserved.