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Characteristics of ErBa2Cu3O7−δ films with BaWO4 doping
- Source :
-
Physica C . Oct2007, Vol. 463-465, p909-913. 5p. - Publication Year :
- 2007
-
Abstract
- Abstract: BaWO4 (BWO) doped ErBa2Cu3O7−δ (Er-123) (BWO+Er-123) films are fabricated and their superconducting properties are evaluated. We discuss the effect of BWO doping into Er-123 films on their crystallinity and superconducting properties. The grown BWO+Er-123 films were in-plane aligned and c-axis oriented. We characterize in-plane crystallinity of the films by XRD in-plane rotation measurement (φ-scan). The full width at a half maximum of the φ-scan pattern (δφ) of the grown BWO+Er-123 films became wider as increasing BWO doping. The critical temperature (T C0) of 2.0wt% BWO+Er-123 films was about 90.5K. From this result, it was confirmed that the BWO+Er-123 films had as high T C as pure Er-123 films. Surface resistance (R S) of the BWO+Er-123 films was degraded comparing to that of a pure Er-123 film. The relationships between critical current density (J C) and applied magnetic field (J C–B) and the magnetic field angular dependence of J C of the grown 2.0wt% BWO+Er-123 film were evaluated at 77K. As a result, it is confirmed that the J C of the Er-123 films in magnetic fields decreased by the BWO doping comparing to that of the pure Er-123 film. However, it was also confirmed that the 2.0wt% BWO+Er-123 film had weak pining centers along the c-axis of Er-123 films. From the result of a cross-sectional transmission electron microscope (TEM) image, some rod structures were observed in the 2.0wt% BWO+Er-123 films. The diameter of the rod was about 20nm. These rods grew along the c-axis of Er-123 films from the substrate to the surface of the film. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09214534
- Volume :
- 463-465
- Database :
- Academic Search Index
- Journal :
- Physica C
- Publication Type :
- Academic Journal
- Accession number :
- 26496279
- Full Text :
- https://doi.org/10.1016/j.physc.2007.04.275