XRD and residual surface stress (sin 2 ψ) measurements were carried out on YBa 2 Cu 3 O x superconductors with varying oxygen stoichiometry (6.3 < x < 7.0). Slopes of the surface strain versus sin 2 ψ were plotted against oxygen content for certain reflections. Compressional surface stress has been found along the c-axis, while a tensile surface stress has been observed along the ab-plane. Both surface stresses were found to vary slightly with oxygen content. These findings qualitatively agree with a very small hydrostatic pressure effect on T c for fully oxygenated YBa 2 Cu 3 O x (x = 7) compared to oxygen deficient material at the surface.
Bibliographical noteFunding Information:
The support provided by King Fahd University of Petroleum and Minerals is gratefully acknowledged. J. Shirokoff would like to thank the Natural Sciences and Engineering Research Council of Canada for financial support.
- Surface residual stress
- X-ray diffraction
- sin ψ analysis
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- General Physics and Astronomy
- Surfaces and Interfaces
- Surfaces, Coatings and Films