Abstract
The Bi-2212 thin films of the Bi 2Ln 0.3Ca 2.7Cu 2O z system (Ln=Pr, Nd, Sm, Eu and Gd) have been prepared by the laser ablation method. The films are of metastable Bi-2212 phase, which has not been synthesized by the solid state reaction method. The highest zero resistivity temperature ( T cz) of 57 K has been found for the film with Ln=Pr, and the valence of Pr determined by XPS measurement was trivalent. Further, each of the films with various Ln elements had a T cz value higher by 12–45 K than the corresponding sample of the bulk Bi 2Ln 0.5Ca 2.5Cu 2O z system.
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