Correlation between in-field critical currents in Zr-added (Gd, Y)Ba2Cu3Ox superconducting tapes at 30 and 77 K.

Critical current (Ic) values of 1384 A/12 mm, corresponding to a critical current density of 12.47 MA cm−2 and a pinning force of 374 GN m−3, have been achieved at 30 K, 3 T in the orientation of field parallel to the c axis (B ∥ c) in (Gd, Y)BaCuO tapes with 15 mol% Zr addition made by metal organic chemical vapor deposition (MOCVD). These tapes show pinning force levels as high as 453 GN m−3 at 30 K. An analysis of the properties of 24–28 (Gd, Y)BaCuO tapes with 15 mol% Zr addition showed a lack of correlation between their critical currents at 30 K, 3 T (B ∥ c) and Ic values both at 77 K, zero field and at 77 K, 1 T (B ∥ c). However, a strong correlation was found between the critical currents at 30 K, 3 T and at 77 K, 3 T (B ∥ c). It has also been discovered that the minimum critical current (Ic, min) value at 77 K, 3 T has no influence on the Ic, min value at 30 K, 3 T, and it in turn depends on the ratio of the Ic values in the orientations of field parallel and perpendicular to the c axis at 77 K, 3 T. [ABSTRACT FROM AUTHOR]