Development of Fluorine-Free MOD REBCO Tape With BaHfO3 Artificial Pinning Centers

We fabricated REBCO films with BaHfO3(BHO) artificial pinning centers by the Fluorine-Free MOD (FF-MOD) method on IBAD tapes. While it is known thatJcdecreases as the misalignment angle increases, a highIcof more than 500 A/4 mm-width at 77 K, self-field was obtained on the CeO2layer with Δφof a wide range up to 7.5 degrees. The Δφof REBCO decreased sharply with the REBCO thickness up to 0.35 μm, suggesting that texture improvement occurred during the crystal growth of FF-MOD films, which contributed to the highIc. The in-fieldIcof REBCO with BHO was enhanced with increasing BHO content, and 171 A/4 mm-width at 20 K under 18 T was achieved. REBCO tapes over 200 m-long with 2.7 mol% BHO were fabricated, and no significantIcdrop was observed and a high averageIcof 467 A/4 mm-width at 77 K, self-field was obtained. These results show the great potential of FF-MOD tape in low-cost commercial applications.