Strong enhancement of flux pinning in thick NdBa2Cu3O7-δ films grown on ion-beam assisted deposition-MgO templates via three-dimensional self-assembled stacks of BaZrO3 nanodots

Thick, epitaxial NdBa2Cu3O7-δ (NdBCO) films (up to 2.1 μm) with a high density of nanoscale columnar defects parallel to the c-axis of the film were deposited on ion-beam assisted deposition-MgO templates via pulsed laser deposition. The columnar defects were composed of self-assembled BaZrO3 (BZO)...

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Bibliographic Details
Published in:Journal of applied physics 2007-09, Vol.102 (6)
Main Authors: Wee, S. H., Goyal, A., Li, J., Zuev, Y. L., Cook, S.
Format: Article
Language:English
Subjects:
BARIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
DEFECTS
ENERGY BEAM DEPOSITION
MAGNETIC FLUX
MATERIALS SCIENCE
NEODYMIUM OXIDES
QUANTUM DOTS
THICKNESS
ZIRCONIUM OXIDES
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Summary:Thick, epitaxial NdBa2Cu3O7-δ (NdBCO) films (up to 2.1 μm) with a high density of nanoscale columnar defects parallel to the c-axis of the film were deposited on ion-beam assisted deposition-MgO templates via pulsed laser deposition. The columnar defects were composed of self-assembled BaZrO3 (BZO) nanodots. A significant enhancement in Jc for H∥c is found for these films. In addition, an overall improvement in the in-field Jc at all field orientations is observed. Compared to pure NdBCO of similar thickness, the in-field Jc at H∥c for 0.7 μm thick NdBCO+BZO film is improved by a factor of 2–4 in the field range of 0.1–4 T and 10–20 at 7–8 T at 77 K. In addition, a smaller α∼0.17 is found in the field regime where Jc∼H−α. Also, a higher maximum pinning force, Fpmax∼14 GN∕m3, is found at 3 T and a larger Hirr over 8 T is found for the NdBCO films with columnar defects.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2781534