Fabrication of 93.7 m long PLD-EuBCO + BaHfO3 coated conductors with 103 A/cm W at 77 K under 3 T

• A 93.7 m long EuBCO + BHO CC with 103 A/cm W at 77  K under 3 T was obtained.
• The 93.7 m long CC showed high Ic values and high n-values with high uniformity.
• The average Ic value at 77 K under 3 T was estimated by that at 77 K under 0.3 T.

Introduction of artificial pinning centers such as BaHfO3 (BHO), BaZrO3 (BZO) and BaSnO3 (BSO) into REBa2Cu3O7−δ (REBCO) coated conductor (CC) layers could improve the in-field critical currents (Ic) in wide ranges of temperatures and magnetic fields. In particular, a combination of EuBCO + BHO has been found to be effective for attaining high in-field Ic performance by means of IBAD/PLD process in short length samples. In this work, we have successfully fabricated a 93.7 m long EuBCO + BHO CC with 103 A/cm W at 77 K under a magnet field (B) of 3 T applied perpendicular to the CC (B//c). The 93.7 m long EuBCO + BHO CC had high uniformity of Ic values and n-values without any trend of fluctuations, independent of the external field up to 0.3 T. Ic–B–applied angle (θ) profiles of the 93.7 m long EuBCO + BHO CC sample showed the high in-field Ic values in all directions of applied magnetic fields especially B//c (at θ ∼ 180°, Ic = 157 A/cm W) at 77 K under 3 T. The profiles were about the same as those in a short length sample.