Superconducting YBa₂Cu₃O_x films prepared on YSZ polycrystalline substrates by rf thermal plasma evaporation

Abstract

As-grown YBa₂Cu₃O_x films prepared on single crystal (100)MgO substrates by rf thermal plasma evaporation have the advantages of a high deposition rate of 730 nm/min, a large area deposition over 300 cm², and a high J_c of 6.8 × 10⁵ A/cm² (77 K, O T), as reported in previous papers.^1,2 We report in this paper about the preparation of YBa₂Cu₃O_x films on yttria-stabilized zirconia (YSZ) polycrystalline substrates for a practical application using this technique to synthesize these films on flexible (metal or flexible polycrystal) substrates. Films prepared on YSZ polycrystalline substrates grew with a c-axis orientation at a relatively high deposition rate and exhibited a zero resistance temperature (T_cO) of 88 K and a critical current density J_c of 3500 A/cm² (77 K, O T). Films prepared on flexible YSZ polycrystalline tapes with a length of 100 mm were also grown with a c-axis orientation and exhibited _TcO) over 77 K.