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

Abstract

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 93.7m long EuBCO+BHO CC with 103A/cmW at 77K under a magnet field (B) of 3T applied perpendicular to the CC (B//c). The 93.7m 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 0.3T. Ic–B–applied angle (θ) profiles of the 93.7m 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=157A/cmW) at 77K under 3T. The profiles were about the same as those in a short length sample.