Characteristics of High-$J_{c}$ GdBCO Coated Conductors Fabricated by the RCE-DR Process

Soon-Mi Choi Soon-Mi Choi,Sang-Im Yoo Sang-Im Yoo,Seung-Hyun Moon Seung-Hyun Moon,Gye-Won Hong Gye-Won Hong,Jung-Woo Lee Jung-Woo Lee,Jae-Hun Lee Jae-Hun Lee,Gang-Hwan Shin Gang-Hwan Shin

doi:10.1109/tasc.2012.2234814

Soon-Mi Choi Soon-Mi Choi, Sang-Im Yoo Sang-Im Yoo + Show 5 more

https://doi.org/10.1109/tasc.2012.2234814

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Abstract

We report the characteristics of GdBa 2 Cu 3 O 7-δ (GdBCO) coated conductors (CCs) on LaMnO 3 (LMO)-buffered IBAD MgO template, produced by the Reactive Co-Evaporation Deposition & Reaction (RCE-DR) process. The transport and magnetic critical current density ( J c ) values of GdBCO CC samples were 3.7 and 2.92 MA/cm 2 at 77 K in self-field for B // c , respectively. Analyses by transmission electron microscopy revealed that a large amount of elongated round Gd 2 O 3 particles with 70-150 nm size and a small amount of the Cu-O phase were trapped in the GdBCO matrix, and a thick layer of the Cu-O phase was also found on the top surface of the GdBCO film, suggesting that the GdBCO film must be grown by the peritectic recombination reaction between Gd 2 O 3 and a liquid phase. While both the GdBCO film and some Gd 2 O 3 particles grown on the LMO-buffer layer were biaxially textured, the Gd 2 O 3 particles fully trapped in the GdBCO matrix were randomly oriented. The GdBCO film by RCE-DR possessed slightly degraded value of exponent α ~ 0.84 in the power-law relationship J c ~ H - a and rather large anisotropy in field-orientation dependence of J c , J c (θ), and thus refinement of Gd 2 O 3 particles may be required for stronger flux pinning.

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