Superconductivity of Bi system thin films formed by consecutively sputtering three Pb-doped targets of slightly different compositions

Superconducting Bi system thin films have been formed on MgO(100) substrates by RF magnetron sputtering from three lightly Pb-doped targets: Bi 2.4 Pb 0.6 Sr 2 Ca 2 Cu 3 O x , Bi 1.6 Pb 0.4 Sr 3 Ca 3 Cu 3 O x and Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 4.5 O x . To improve the superconductivity of the as-grown f...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1990-02, Vol.29 (2), p.L291-L293
Main Authors: KURODA, K, KOJIMA, K, TANIOKU, M, YOKOYAMA, K, HAMANAKA, K
Format: Article
Language:English
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Summary:Superconducting Bi system thin films have been formed on MgO(100) substrates by RF magnetron sputtering from three lightly Pb-doped targets: Bi 2.4 Pb 0.6 Sr 2 Ca 2 Cu 3 O x , Bi 1.6 Pb 0.4 Sr 3 Ca 3 Cu 3 O x and Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 4.5 O x . To improve the superconductivity of the as-grown films, the films were kept in a sputtering chamber after deposition. The film, formed at 660°C and kept at the same substrate temperature and gas pressure as the sputtering conditions for 5 h after deposition, showed zero resistivity at 83 K and a resistivity drop at 115 K. The critical current density of the film was 4×10 5 A/cm 2 at 77 K and 1×10 7 A/cm 2 at 52 K.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.29.l291