Double-disordered HTS coated conductors and their assemblies aimed for ultra-high fields: large area tapesстатья
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Дата последнего поиска статьи во внешних источниках: 2 сентября 2020 г.
Аннотация: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/mm2 at 18 and 31 T, respectively, measured at 4.2 K and B||c. Tape architecture is based on 50-100 μm 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 characterized using phi-scan XRD technique. High-resolution nano-structural analysis indicated a number of non-usual features in DD YBCO layers regarding “firework”-like ori-entation of nano-precipitations /nano-chains. These new features result in a very high concentration of local defects which reduce the critical current (Ic) measured at 77 K, self-field to about 30 % of the corresponding Ic in non-DD YBCO, and simultaneously lead to substantial gaining of Ic at high fields. The main result is a substantial improvement of Ic and engineering current density (Jc) achieved at high field and liquid Helium temperature in long length, large area tapes with 4 and 12 mm width. Je above 970 A/mm2 at 4.2 K, B = 18 T, B||c was achieved in 12 mm wide tape.