The Incorporation of Nanoscale Columnar Defects Comprised of Self-Assembled BaZrO₃ Nanodots to Improve Flux-Pinning and Critical Current Density of NdBa₂Cu₃O_7-δ Films Grown on RABiTS

Journal Article · Mon Jan 01 00:00:00 EST 2007 · Superconductor Science & Technology

DOI:https://doi.org/10.1088/0953-2048/20/8/012· OSTI ID:931750

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

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1. ORNL

We report significant enhancement in the flux-pinning of epitaxial NdBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (NdBCO) films on rolling-assisted biaxially textured substrates (RABiTS) via the incorporation of a two-dimensional array of columnar defects comprised of self-assembled BaZrO3 (BZO) nanodots. Pure NdBCO films and NdBCO films incorporating BZO nanodots, both with the same thickness of 0.6 {micro}m, were epitaxially grown on RABiTS by pulsed laser deposition. A very dense and homogeneous distribution of BZO nanodot columns with typical intercolumn spacing of around 15-20 nm oriented along the c-axis of the film was observed in the NdBCO+BZO film. Compared to the pure NBCO film on RABiTS, the NdBCO+BZO film on RABiTS has an in-field critical current density (J{sub c}) of a factor of more than 2 in 0.1-1.5 T and a smaller power-law exponent {alpha}{approx}0.21 in the field regime where J{sub c}{approx}H{sup -{alpha}}.

• 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: 931750
• Journal Information: Superconductor Science & Technology, Vol. 20, Issue 8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
CURRENT DENSITY
CRITICAL CURRENT
DEFECTS
MAGNETIC FLUX
BARIUM OXIDES
ZIRCONIUM OXIDES
QUANTUM DOTS
ADDITIVES
NEODYMIUM OXIDES
COPPER OXIDES
SUBSTRATES