Abstract
The critical current density (J_c) dependence on an applied magnetic field was studied for a prototype REBCO with Zr doping content coated conductor fabricated by metal-organic chemical vapor deposition (MOCVD). The study revealed that different rare-earth (RE) cations were incorporated into the superconducting film to form RE₂O₃ and BaZrO₃ (BZO). RE₂O₃ nanoparticles had a stronger pinning effect on magnetic flow along the direction of the a-b plane of films. With the increase of RE content, many RE₂O₃ nanoparticles effectively inhibited the precipitation of Ba-Cu-O heterophase, and when RE/Ba ≥ 0.65, the increase of coarse Ba-Cu-O phases wrecked the continuity of matrix and crystal quality of films, causing a decrease on J_c (90°). After excessive RE elements (RE/Ba = 0.70) were doped in film, RE₂O₃ phases were changed from granular to lamellar and cut off the continuous growth of BZO along the c-axis, reducing J_c (0°) of films.

Key words
rare-earth barium copper oxide (REBCO), RE₂O₃, BZO, rare-earth (RE), critical current density (J_c)

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