Current Transport Properties of TFA-MOD Processed Long-Length $\mbox{Y}_{\mathrm{x}}\mbox{Gd}_{1\mbox{-}{\mathrm{x}}}\mbox{Ba}_{2}\mbox{Cu}_{3}\mbox{O} _{\mathrm{y}}$ Coated Conductor Doped With $\mbox{BaZrO}_{3}$ Artificial Pinning Centers

We have investigated the current transport properties of batch furnace processed TFA-MOD Y
_x
Gd
_1-x
Ba
₂
Cu
₃
O
_y
(YGdBCO) coated conductor (CC) doped with nanoscale BaZrO
₃
artificial pinning centers (APCs). As the comparison with those of previous processed YGdBCO CC, it has been confirmed that the present process is very effective to improve current carrying performance of the CC at not only high-temperature but also low-temperature region, for example, the I
_c
at 4.2 K and 17 T is 450 A/cm-w, i.e., the engineering J
_c
is 4.3 × 10
⁸
A/m
²
, which is comparable value to that of Nb
₃
Sn wire at 4.2 K. In addition, angular dependences of the I
_c
clearly show the effectiveness of the APCs. Namely, the minimum I
_c
in the whole angle region at 77 K, 3 T increase from 7 to 35 A/cm-w, and the anisotropy of I
_c
is reduced. We will also discuss the analytical expression of in-field current transport property based on the percolation transition model and the scaling law of the flux pinning. By using this analysis, electric field versus current density characteristics in arbitrary conditions of temperature and magnetic field can be described, and also, the statistical distribution of J
_c
can be estimated. These results are important not only for the design of superconducting devices using CCs but also for understanding the pinning properties.