Structural inhomogeneities in thin epitaxial films of YBa2Cu3O7-δ and their effects on superconducting properties

被引:4
作者
Qadri, SB [1 ]
Skelton, EF
Broussard, PR
Cestone, VC
Osofsky, MS
Browning, VM
Reeves, ME
Prusseit, W
机构
[1] USN, Res Lab, Div Condensed Matter & Radiat Sci, Washington, DC 20375 USA
[2] USN, Res Lab, Dept Mat Sci & Technol, Washington, DC 20375 USA
[3] George Washington Univ, Dept Phys, Washington, DC 20052 USA
[4] Tech Univ Munich, Phys Dept E10, D-85747 Garching, Germany
关键词
superconductivity; inhomogeneities;
D O I
10.1016/S0040-6090(97)00597-X
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Structural inhomogeneities in thin single-crystal films of YBa2Cu3O7-delta are characterized using high resolution X-ray diffraction. Results of these measurements show a distribution in the c-axis lattice parameter and variations in the integrated intensities of (OOl) diffraction peaks. Both effects can be interpreted as due to a variance in the oxygen content. Films prepared under identical growth conditions, when subjected to different post-annealing treatments showed varying structural and superconducting properties. A film with 7-delta close to 7.0 had a transition temperature (T-c) of 91 K, a width (Delta T-c) of 0.6 K, and a critical current density (J(c)) of 6.5 x 10(6) A/cm(2), whereas a film in which the oxygen content varied between 6.86 and 6.96 had a T-c of 87 K, a Delta T-c of 0.5 K, and a J(c) of 8.17 x 10(6) A/cm(2). For each of the samples measured, the full width at half maximum (FWHM) of the (006) diffraction peak ranged between 340 and 2100 are-seconds and was dependent on the method of preparation and the substrate. The J(c)s of these films were not sensitive to the quality of the film, as determined from the FWHM of the (006) peak, and the oxygen content, as determined from the (005) to (006) integrated intensity ratio. High resolution X-ray topographs showed uniform microstructure of the films, indicating that oxygen distribution is finely dispersed in the film. (C) 1997 Elsevier Science S.A.
引用
收藏
页码:420 / 424
页数:5
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