Critical current density above 15 MA cm-2 at 30 K, 3 T in 2.2 μm thick heavily-doped (Gd,Y)Ba2Cu3Ox superconductor tapes
Abstract
A critical current (Ic) value of 3963 A/12 mm, corresponding to a critical current density (Jc) of 15 MA cm-2 has been achieved at 30 K, 3 T in the orientation of field parallel to the c-axis (B||c) in 2.2 μm thick film (Gd,Y)BaCuO tapes with 20 mol% Zr addition made by metal organic chemical vapor deposition. This Jc level is more than a factor of four higher than the Jc values of 7.5 mol% Zr-added tapes, which are an industry benchmark. The critical current values in a magnetic field of 3 T parallel to the c-axis in the 2.2 μm thick, 20 mol% Zr-added tape reached 2833 A/12 mm (10.1 MA cm-2), 1881 A/12 mm (7.1 MA cm-2) and 805 A/12 mm (3.1 MA cm-2) at 40 K, 50 K and 65 K respectively. Such high critical current values were possible because of maintaining a strong alignment of BaZrO3 nanocolumns along the c-axis over the entire film thickness.
- Publication:
-
Superconductor Science Technology
- Pub Date:
- July 2015
- DOI:
- 10.1088/0953-2048/28/7/072002
- Bibcode:
- 2015SuScT..28g2002S