Exploring the Effect of the Density of \(\textbf{Y}_{0.5} \textrm{Gd}_{0.5} \textrm{Ba}_2 \textrm{Cu}_3 \textrm{O}_{7-\delta }\) Target on Superconducting Thin Films

Abstract

In this work, the effect of intrinsic doping of YGBCO target density on superconducting thin films is systematically discussed. YGBCO superconducting films generated with varying densities of YGBCO targets are all pure C-axis orientated after process optimization, but the crystallinity of the films varies, and the crystalline property of the superconducting films developed from the target with the lowest density is the best. YGBCO films made with the best density objective had in-plane and out-of-plane textures of 3.5° and 1.4°, respectively. Thin film surface morphology is affected by the density of the target material; the minimal surface roughness can be as low as 5.5 nm, The critical current of YGBCO film prepared by target with the minimum density is 135 A, and the greatest current density is 5.4×\(10^6\) \(\textrm{A}/\textrm{cm}^2\). At 4.2 K and 9 T, the critical current of the thin film created with the intrinsically nailed YGBCO target can reach 338 A. This paper prepares a 530-m-long second-generation high-temperature superconducting tape with the optimized parameters. The current of the long tape is 380 A, and the current density is 4.2×\(10^6\) \(\textrm{A}/\textrm{cm}^2\).