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

Introduction of artificial pinning centers such as BaHfO3 (BHO), BaZrO3 (BZO) and BaSnO3 (BSO) into REBa2Cu3O7-delta (REBCO) coated conductor (CC) layers could improve the in-field critical currents (I,) 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 I-c 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 I-c values and n-values without any trend of fluctuations, independent of the external field up to 0.31. I-c-B-applied angle (theta) profiles of the 93.7 m long EuBCO + BHO CC sample showed the high in-field I-c values in all directions of applied magnetic fields especially B//c (at theta similar to 180 degrees, I-c = 157 A/cm W) at 77 K under 3 T. The profiles were about the same as those in a short length sample. (C) 2015 Elsevier B.V. All rights reserved.