Ba2Y(Nb/Ta)O6-Doped YBCO Films on Biaxially Textured Ni-5at.% W Substrates

The incorporation of nanoscaled pinning centers in superconducting YBa 2 Cu 3 O 7-δ (YBCO) films is one of the core topics to enhance the critical current density J c (B, Θ) of coated conductors. The mixed double-perovskite Ba 2 Y(Nb/Ta)O 6 (BYNTO) can be grown in nanosized columns parallel to the Y...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2016-04, Vol.26 (3), p.1-5
Main Authors: Sieger, Max, Pahlke, Patrick, Hanisch, Jens, Sparing, Maria, Bianchetti, Marco, MacManus-Driscoll, Judith, Lao, Mayraluna, Eisterer, Michael, Meledin, Alexander, Van Tendeloo, Gustaaf, Nast, Rainer, Schultz, Ludwig, Holzapfel, Bernhard, Huhne, Ruben
Format: Article
Language:English
Subjects:
BYNTO
Critical current density (superconductivity)
Current measurement
Magnetic fields
pinning
pulsed laser deposition
RABiTS
Scanning electron microscopy
YBCO
Yttrium barium copper oxide
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Summary:The incorporation of nanoscaled pinning centers in superconducting YBa 2 Cu 3 O 7-δ (YBCO) films is one of the core topics to enhance the critical current density J c (B, Θ) of coated conductors. The mixed double-perovskite Ba 2 Y(Nb/Ta)O 6 (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 c YBCO and plates in the ab-plane containing Y, Nb, and Ta. An improved homogeneity of the critical current density J c over the sample was evaluated from trapped field profiles measured with a scanning Hall probe microscope. The mean J c in the rolling direction of the tape is 1.8 MA/cm 2 (77 K, self-field) and doubles the value of the undoped sample. Angular-dependent measurements of the critical current density, J c (Θ), show a decreased anisotropy of the doped film for various magnetic fields at 77 K and 64 K.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2016.2539254