High-performance irreversibility field and flux pinning force density in BaHfO₃-doped GdBa₂Cu₃O_y tape prepared by pulsed laser deposition

The high irreversibility field B_i and strong flux pinning force were obtained for BaHfO₃-doped GdBa₂Cu₃O_y tapes on a metallic Hastelloy substrate with an ion beam-assisted deposition MgO buffer layer. At 77.3 K, B_i of 15.8 T and the maximum flux pinning force density of 23.5GN/m³ for B || c were achieved for the 1.5 vol% BaHfO₃-doped GdBa₂Cu₃ O_y tape, which are the world's highest recorded values for REBa₂Cu₃O_y-coated conductors on metallic substrates (RE = rare earth). From the flux pinning analysis, the c-axis correlated pinning by well-aligned BaHfO₃ nanorods plays an important role in achieving the high irreversibility field and flux pinning force density performance.