Artificial Flux Pinning in MOD-REBCO Coated Conductors With Thick Superconducting Layer

The BaZrO
₃
(BZO) and BaHfO
₃
(BHO) nanocrystal addition strategy was extended to up-scaling YBa
₂
Cu
₃
O
_7-δ
(YBCO) coated conductors as long as hundreds of meters with a superconducting layer thickness of 3.2 µm. The
I
_c
(77 K, self-field) achieved 1000 A/12 mm-width with 5 mol% BZO addition. It is revealed that the
I
_c
(77 K, self-field) of YBCO thick tapes decreases to 700 A with BHO concentration up to 10%, while its in-field
I
_c
enhances to 1450 A at 30 K@3 T. The transport measurement showed that the
$I_c$
@4.2 K at a high field as 20 T achieved 290 A/4 mm-width. The angular dependence of in-field
I
_c
demonstrated that significant improvement occurs in almost the angular range after nanocrystal additions except
B
//
ab
. Interestingly, due to the addition of small-size nanocrystals as pinning centers, the
$I_c$
@77 K under the field <2 T exhibited near isotropic behaviors when applied to different magnetic field angles.