Superconductivity in the Y-La-Ba-Cu-O system

The synthesis of a range of copper perovskites of general formula Y n La 2− n+ x Ba 4− x Cu 6O 14+ y (n =0, 1 ( for which 0⩽x⩽1) and n=2 (0⩽ x⩽2) is reported. These materials have been characterized by X-ray diffraction, thermogravimetric analysis, dc resistivity and ac susceptibility measurements....

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Bibliographic Details
Published in:Solid state ionics 1989-02, Vol.32, p.1115-1124
Main Authors: Grasmeder, J.R., Weller, M.T., Lachester, P.C., Meats, C.E.
Format: Article
Language:English
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Summary:The synthesis of a range of copper perovskites of general formula Y n La 2− n+ x Ba 4− x Cu 6O 14+ y (n =0, 1 ( for which 0⩽x⩽1) and n=2 (0⩽ x⩽2) is reported. These materials have been characterized by X-ray diffraction, thermogravimetric analysis, dc resistivity and ac susceptibility measurements. Substitution of yttrium by lanthanum in YBCO results in only minor variations in physical properties; replacement of barium by lanthanum causes a more dramatic reduction of T c. Structural studies by low temperature neutron powder diffraction reveal a previously unreported distortion of the Cu-O chains in some of these materials.
ISSN:0167-2738
1872-7689
DOI:10.1016/0167-2738(89)90405-0