Strong Enhancement of Flux-Pinning in Thick NdBa₂Cu₃O_7-δ Films Grown on Ion-Beam Assisted Deposition-MgO Templates via Three-Dimensional Self-Assembled Stacks of BaZrO₃ Nanodots

Journal Article · Mon Jan 01 00:00:00 EST 2007 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2781534· OSTI ID:931807

Wee, Sung Hun ^[1]; Goyal, Amit ^[1]; Li, Jing ^[1]; Zuev, Yuri L ^[1]; Cook, Sylvester W ^[1]

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1. ORNL

Thick, epitaxial NdBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (NdBCO) films (up to 2.1 {micro}m) 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 BaZrO{sub 3} (BZO) nanodots. A significant enhancement in J{sub c} for H||c is found for these films. In addition, an overall improvement in the in-field J{sub c} at all field orientations is observed. Compared to pure NdBCO of similar thickness, the in-field Jc at H||c for 0.7 {micro}m 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 {alpha}{approx}0.17 is found in the field regime where J{sub c}{approx}H{sup -{alpha}}. Also, a higher maximum pinning force, F{sub p}{sup max}{approx}14 GN/m3, is found at 3 T and a larger H{sub irr} over 8 T is found for the NdBCO films with columnar defects.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: OE USDOE - Office of Electric Transmission and Distribution
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 931807
• Journal Information: Journal of Applied Physics, Vol. 102, Issue 6; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MAGNETIC FLUX
THICKNESS
FILMS
NEODYMIUM OXIDES
BARIUM OXIDES
COPPER OXIDES
QUANTUM DOTS
ZIRCONIUM OXIDES
DEFECTS
ENERGY BEAM DEPOSITION
CURRENT DENSITY
CRITICAL CURRENT