Development of Biaxially Textured Buffer layers on Rolled-Ni Substrates for High Current YBa_2Cu_3O_(7-y) Coated Conductors

摘要

This paper describes the development of three buffer layer architectures with good biaxial textures on rooled-Ni substrates using vacuum processing techniques. The techniques include pulsed laser ablation, e-beam evaporation, dc and rf magnetron sputtering. The first buffer layer architecture consists of an epitaxial laminate of Ag/Pd(Pt)/Ni. The second buffer layer consists of an epitaxial laminate of CeO_2/CeO_2/Ni. The third alternative buffer layer architecture consists of an epitaxial laminate of YSZ/CeO_2/NI. The cube (100) texture in the Ni was produced by cold-rolling followed by recrystallization. The crystallographic orientations of the Pd, Ag, CeO_2, and YSZ films grown were all (100). We recently demonstrated a critical-current density of 0.73 x 10~6 A/cm~2 at 77 K and zero field on 1.4 mu m thick YBa_2Cu_3O_(7-6) (YBCO) films. This film was deposited by pulsed laser ablation on a YBCO/YSZ/CeO_2/Ni substrate.