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A main challenge that significantly impedes REBa 2 Cu 3 O x  (RE = rare earth) coated conductor applications is the low engineering critical current density  J    e   because of the low superconductor fill factor in a complicated layered structure that is crucial for REBa 2 Cu 3 O x  to carry supercurrent. Recently, we have successfully achieved engineering critical current density beyond 2.0 kA/mm 2  at 4.2 K and 16 T, by growing thick REBa 2 Cu 3 O x  layer, from ∼1.0 μm up to ∼3.2 μm, as well as controlling the pinning microstructure. Such high engineering critical current density, the highest value ever observed so far, establishes the essential role of REBa 2 Cu 3 O x  coated conductors for very high field magnet applications. We attribute such excellent performance to the dense  c -axis self-assembled BaZrO 3  nanorods, the elimination of large misoriented grains, and the suppression of big second phase particles in this ~3.2 μm thick REBa 2 Cu 3 O x  film.

J e (4.2 K, 31.2 T) beyond 1 kA/mm2 of a ~3.2 μm thick, 20 mol% Zr-added MOCVD REBCO coated conductor