[14p-D63-1~10] 11.2 Thin and thick superconducting films, coated conductors and film crystal growth

[14p-D63-1] Microstructures of Y-based high-T_C superconducting wires having a conductive Nb-doped SrTiO₃ buffer layer with different thickness

〇Ataru Ichinose^1,3, Masayuki Hashimoto², Shigeru Horii^2,3, Toshiya Doi^2,3 (1.CRIEPI, 2.Kyoto Univ., 3.JST-ALCA)

Keywords:superconductor, condyctive buffer layer, YBCO

We propose a new Y-based high-T_C superconducting wire configuration having a metal substrate with a function of electric stability and a conductive buffer layer in order to develop a low-cost Y-based high-T_C superconducting wire. So far, we have obtained a YBCO superconducting wire with high-J_C performance of 2.6 MA/cm² at 77 K using a conductive Nb-STO buffer layer. However, It has been confirmed to exist partially thin metal oxide layer on the metal substrate surface by cross-sectional microstructure observation. We report the change of metal oxide layer when the thickness of Nb-STO layer is varied.