Double-disordered HTS-coated conductors and their assemblies aimed for ultra-high fields : large area tapes

Double disordered (DD) HTS layers processed via high-fluence PLD with modulated pressure and barium zirconate precipitation yield very high engineering current densities, above 900 and 600 A/mm(2) at 18 and 31 T, respectively, measured at 4.2 K and B||c. Tape architecture is based on 50-100-mu m-thick polished stainless steel tape which prior to DD-HTS deposition was coated with YSZ template yielding a biaxial in-plane texture with FWHM = 10-11 degrees characterized using phi-scan XRD technique. High-resolution nanostructural analysis indicated a number of nonusual features inDDYBCOlayers regarding "firework"-like orientation of nanoprecipitations /nanochains. These new features result in a very high concentration of local defects which reduce the critical current (I-c) measured at 77 K, self-field to about 30% of the corresponding I-c in non-DD YBCO, and simultaneously lead to substantial gaining of I-c at high fields. The main result is a substantial improvement of I-c and engineering current density (J(e)) achieved at high field and liquid Helium temperature in long length, large area tapes with 4 and 12 mm width. J(e) above 970 A/mm2 at 4.2 K, B = 18 T, B||c was achieved in 12-mm-wide tape.

Language

English

Source (journal)

IEEE transactions on applied superconductivity / IEEE. - New York, N.Y.

Publication

New York, N.Y. : 2018

ISSN

1051-8223

DOI

10.1109/TASC.2018.2801348

Volume/pages

28 :4 (2018) , 6 p.