Title
<tex>$Ba_{2}Y(Nb/Ta)O_{6}$</tex> doped YBCO films on biaxially textured Ni-5at.% W substrates
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
IEEE transactions on applied superconductivity / IEEE [New York, N.Y.] - New York, N.Y.
Volume/pages
26(2016) :3 , p. 1-4
ISSN
1051-8223
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The incorporation of nanoscaled pinning centers in superconducting YBa2Cu3O7-δ (YBCO) films is one of the core topics to enhance the critical current density Jc(B, Θ) of coated conductors. The mixed double-perovskite Ba2Y(Nb/Ta)O6 (BYNTO) can be grown in nanosized columns parallel to the YBCO c-axis and in steplike patterns, making it customizable to meet specific working conditions (T, B, Θ). We compare a 1.6 μm thick film of pure YBCO and a similar film with additional 5 mol% of BYNTO, grown by pulsed laser deposition with a growth rate of 1.6 nm/s on chemically buffered biaxially textured Ni-5at.% W tape. Our doped sample shows nanosized BYNTO columns parallel to cYBCO and plates in the ab-plane containing Y, Nb, and Ta. An improved homogeneity of the critical current density Jc over the sample was evaluated from trapped field profiles measured with a scanning Hall probe microscope. The mean Jc in the rolling direction of the tape is 1.8 MA/cm2 (77 K, self-field) and doubles the value of the undoped sample. Angular-dependent measurements of the critical current density, Jc(Θ), show a decreased anisotropy of the doped film for various magnetic fields at 77 K and 64 K.
E-info
https://repository.uantwerpen.be/docman/iruaauth/1fa9f0/133781.pdf
Handle