Microstructure of 110 K superconducting Bi-Sr-Ca-Cu-O thin films grown on (100)MgO by metallo-organic decomposition

1-, 2-, 4- and 6-layer superconducting Bi-Sr-Ca-Cu-O (BSCCO) thin films have been prepared on (100) MgO substrate by metallo-organic decomposition. The 4- and 6-layer films reach zero resistance state at T>100 K. X-ray diffraction shows the oxide films to consist of three phases identifiable by t...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1990-05, Vol.167 (5), p.614-626
Main Authors: Lelental, M., Chen, Samuel, Lee, S.-Tong, Braunstein, G., Blanton, T.
Format: Article
Language:English
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Summary:1-, 2-, 4- and 6-layer superconducting Bi-Sr-Ca-Cu-O (BSCCO) thin films have been prepared on (100) MgO substrate by metallo-organic decomposition. The 4- and 6-layer films reach zero resistance state at T>100 K. X-ray diffraction shows the oxide films to consist of three phases identifiable by their unique c-axis values of 24, 30 and 38 Å. These films show a high degree of orientation in which the c-axis of the grains are aligned perpendicular to the substrate surface. In the 2-layer film, transmission electron microscopy indicates the oriented grain growth to be primarily either (130)BSCCO(100)MgO or (100)BSCCO (100)MgO. Ion channeling measurements using He ++ at energies ranging between 1 to 4.5 MeV, show that the polycrystalline grains in the film have a highly oriented mosaic structure, and among all the films, the 2-layer system exhibits the highest degree of alignment with (100)MgO.
ISSN:0921-4534
1873-2143
DOI:10.1016/0921-4534(90)90681-4