Fabrication of Eu1Ba2Cu3O7−δ+BaHfO3 coated conductors with 141 A/cm-w under 3 T at 77 K using the IBAD/PLD process

• A new combination of EuBCO + BHO system was investigated by the IBAD/PLD process.
• A EuBCO + BHO film showed extremely high property of 141 A/cm-w at 77 K, 3 T.
• A 200 m long EuBCO + BHO CC with 55.5 A/cm-w at 77 K, 3 T was fabricated.
• A 93.7 m long EuBCO + BHO CC with 108 A/cm-w at 77 K, 3 T was fabricated.

Introduction of artificial pinning centers such as BaZrO3 (BZO), BaSnO3 (BSO), BaHfO3 (BHO) nano-rods is effective to improve in-field critical currents (Ic). In particular, the BHO doping into Gd1Ba2Cu3O7−δ had been found to exhibit high in-field Ic under wide ranges of temperatures and magnetic fields. Furthermore, a long coated conductor (CC) with high in-field properties and high uniformity was successfully fabricated by means of BHO doping. However, increase of the Ic values exhibited somewhat in a saturated manner with thickening the superconducting films above 3 μm. In this work, a new combination of Eu1Ba2Cu3O7−δ (EuBCO) + BHO system was investigated using the IBAD/PLD process to improve in-field performance especially in thick films. As a result, it was found that a EuBCO + BHO film with 3.6 μm in thickness showed extremely high property of 141 A/cm-w measured at 77 K, 3 T. This high in-field Ic value was tentatively explained due to suppression of a-axis oriented grains even in thick films. A 200 m long EuBCO + BHO CC with 55.5 A/cm-w and a 93.7 m long CC with 108 A/cm-w measured at 77 K, 3 T were successfully fabricated.