%0 Journal Article
%K Superconducting materials
%K Laser Beams–Applications
%K Stacking Defects
%K Superconducting Films–Thin Films
%K Yttrium Compounds–Thin Films
%K Cationic Vacancy Ordered Defect Structure
%K Laser-Deposited Thin Films
%K Yttrium Barium Copper Oxide Thin Films
%A Ramamoorthy Ramesh
%A T.S Ravi
%A D.M Hwang
%A A Inam
%A X.X Xi
%A X.D Wu
%A T Venkatesan
%A R Kilaas
%B Materials Letters
%D 1990
%G eng
%P 23-27
%R 10.1016/0167-577X(90)90006-8
%T Direct observation of a new cationic vacancy ordered defect structure in laser-deposited superconducting YBaCuO thin films
%V 10
%X The Y2Ba4Cu8O16 phase is the most common stacking defect observed in laser-deposited YBaCuO thin films. In this we report for the fist time, the existence of a cationic vacancy ordered Y2Ba4Cu8O16 structure in which every alternate pair of Cu atoms in the two chain layers are missing. This new structure is a polytype of the Y1Ba2Cu3O7 phase, i.e. it has the "Y2Ba4Cu8O16" structure but the "Y1Ba2Cu3O7" composition. Some possible causes and consequences of the formation of this defect structure are discussed. © 1990.