This title appears in the Scientific Report :
2020
Please use the identifier:
http://dx.doi.org/10.1088/1361-6668/ab6ee5 in citations.
Please use the identifier: http://hdl.handle.net/2128/25725 in citations.
YBa 2 Cu 3 O 7−x films with Ba 2 Y(Nb,Ta)O 6 nanoinclusions for high-field applications
YBa 2 Cu 3 O 7−x films with Ba 2 Y(Nb,Ta)O 6 nanoinclusions for high-field applications
The structural and transport properties of YBa2Cu3O7−x films grown by pulsed laser deposition with mixed 2.5 mol% Ba2YTaO6 (BYTO) and 2.5 mol% Ba2YNbO6 (BYNO) double-perovskite secondary phases are investigated in an extended film growth rate, R = 0.02–1.8 nm s−1. The effect of R on the film microst...
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Personal Name(s): | Celentano, G. (Corresponding author) |
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Rizzo, F. / Augieri, A. / Mancini, A. / Pinto, V. / Rufoloni, A. / Vannozzi, A. / MacManus-Driscoll, J. L. / Feighan, J. / Kursumovic, A. / Meledin, A. / Mayer, J. / Van Tendeloo, G. | |
Contributing Institute: |
Materialwissenschaft u. Werkstofftechnik; ER-C-2 |
Published in: | Superconductor science and technology, 33 (2020) 4, S. 044010 - |
Imprint: |
Bristol
IOP Publ.
2020
|
DOI: |
10.1088/1361-6668/ab6ee5 |
Document Type: |
Journal Article |
Research Program: |
Enabling Science and Technology through European Electron Microscopy Controlling Configuration-Based Phenomena |
Link: |
Published on 2020-02-20. Available in OpenAccess from 2021-02-20. Restricted Published on 2020-02-20. Available in OpenAccess from 2021-02-20. Restricted |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/25725 in citations.
The structural and transport properties of YBa2Cu3O7−x films grown by pulsed laser deposition with mixed 2.5 mol% Ba2YTaO6 (BYTO) and 2.5 mol% Ba2YNbO6 (BYNO) double-perovskite secondary phases are investigated in an extended film growth rate, R = 0.02–1.8 nm s−1. The effect of R on the film microstructure analyzed by TEM techniques shows an evolution from sparse and straight to denser, thinner and splayed continuous columns, with mixed BYNO + BYTO (BYNTO) composition, as R increases from 0.02 nm s−1 to 1.2 nm s−1. This microstructure results in very efficient flux pinning at 77 K, leading to a remarkable improvement in the critical current density (Jc) behaviour, with the maximum pinning force density Fp(Max) = 13.5 GN m−3 and the irreversibility field in excess of 11 T. In this range, the magnetic field values at which the Fp is maximized varies from 1 T to 5 T, being related to the BYNTO columnar density. The film deposited when R = 0.3 nm s−1 exhibits the best performances over the whole temperature and magnetic field ranges, achieving Fp(Max) = 900 GN m−3 at 10 K and 12 T. At higher rates, R > 1.2 nm s−1, BYNTO columns show a meandering nature and are prone to form short nanorods. In addition, in the YBCO film matrix a more disordered structure with a high density of short stacking faults is observed. From the analysis of the Fp(H, T) curves it emerges that in films deposited at the high R limit, the vortex pinning is no longer dominated by BYNTO columnar defects, but by a new mechanism showing the typical temperature scaling law. Even though this microstructure produces a limited improvement at 77 K, it exhibits a strong Jc improvement at lower temperature with Fp = 700 GN m−3 at 10 K, 12 T and 900 GN m−3 at 4.2 K, 18 T. |