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Title
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doped YBCO films on biaxially textured Ni-5at.% W substrates
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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IEEE transactions on applied superconductivity / IEEE [New York, N.Y.] - New York, N.Y.
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Publication
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New York, N.Y.
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2016
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ISSN
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1051-8223
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DOI
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10.1109/TASC.2016.2539254
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Volume/pages
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26
:3
(2016)
, p. 1-4
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ISI
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000375581500001
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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