Superconductivity in Bi-2212 thin films of Bi sub(2)Ln sub(0.3)Ca sub(2.7)Cu sub(2)O sub(z) (Ln identical with Pr, Nd, Sm, Eu and Gd) prepared by laser ablation method

The Bi-2212 thin films of the Bi sub(2)Ln sub(0.3)Ca sub(2.7)Cu sub(2)O sub(z) system (Ln identical with 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 z...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2000-01, Vol.329 (4), p.292-297
Main Authors: Yoshida, K, Sasakura, H, Tsukui, S, Oshima, R, Mizokawa, Y
Format: Article
Language:English
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Summary:The Bi-2212 thin films of the Bi sub(2)Ln sub(0.3)Ca sub(2.7)Cu sub(2)O sub(z) system (Ln identical with 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 sub(cz)) of 57 K has been found for the film with Ln identical with Pr, and the valence of Pr determined by XPS measurement was trivalent. Further, each of the films with various Ln elements had a T sub(cz) value higher by 12-45 K than the corresponding sample of the bulk Bi sub(2)Ln sub(0.5)Ca sub(2.5)Cu sub(2)O sub(z) system.
ISSN:0921-4534