Improved Performance of CSD-Grown Y_{1- x} Gd _x Ba₂Cu₃O₇-BaHfO₃ Nanocomposite Films on Ni5W Substrates

Abstract

Y 1-x Gd x Ba 2 Cu 3 O 7 -BaHfO 3 (YGBCO-BHO) nanocomposite films containing 12 mol% BHO nanoparticles and different amounts of Gd, x, were grown by Chemical Solution Deposition (CSD) on Ni5W substrates in order to investigate the impact of the rare-earth stoichiometry on the structure and superconducting properties of these films. For Gd contents x > 0.5, epitaxial YGBCO-BHO films with an approximate thickness of 270 nm self-field critical current density J c at 77 K ∼ 1,5 MA/cm² were obtained. The field dependence of the critical current density J c (B) shows a much larger accommodation field and lower exponents α in J c ∼ B −α values compared to pristine YBCO films. This is both due to the high amount of individual nanoparticles in the matrix as observed in TEM images and the higher critical temperatures T c . The results show that the CSD is a potential candidate for the preparation of REBCO films in long-length coated conductors. I. INTRODUCTIONT HE fabrication of second-generation high-temperature superconducting tapes or Coated Conductors (CCs) is one most active areas in the field of superconductivity. In general, the architecture of these CCs consist of a metallic substrate, several buffer layers, the superconducting films and some protective coatings. The superconducting films in the CCs are usually made by REBa 2 Cu 3 O 7 (REBCO, RE rare earth) compounds whose properties make them appropriate for various electric power applications [1]- [3].The choice of the most suitable REBCO for the fabrication of the CCs is often difficult. Most of the research nowadays is devoted to YBa 2 Cu 3 O 7 (YBCO) but there are other REBCO compounds that exhibit, in some cases, better superconducting properties [4]- [7]. Nevertheless, and despite the advantages, the

Progress in superconducting REBa2Cu3O7 (RE = rare earth) coated conductors derived from fluorinated solutions

“…The rules to develop large percolating critical current density in YBCO films grown through the BaF 2 route have been now widely applied to several REBCO CCs using different substrates and the success in achieving high self-field critical currents has been widely demonstrated [28,36,207,211]. We should mention, for instance, the extension of the CSD growth process to other REBCO compositions which required tuning the growth conditions (figure 23), and they were applied in Y 1−x Gd x BCO conductors on RABiT and IBAD substrates [63,169,171,216]. As it has been described previously (section 3.1), it was necessary to fine tune the temperature and PO 2 conditions for growth to minimize the formation of BCO at the substrate interface and, depending on the quality of the buffer layer of the metallic substrate [58,80,81,142,171,172].…”

Size-Controlled Oxide Perovskite Nanocrystal Synthesis: Design, Optimization, and Mechanism Insights

“…Among the different families of NCs, oxide perovskites are versatile materials, enabling various applications in diverse fields due to their large number of compositions and structures. To name some, perovskites feature properties such as ferromagnetism, piezoelectricity and ferroelectricity, multiferroics, superconductivity, , ion conductivity, catalytic activity, and their use as electrode materials . Such properties are strongly dependent on the size, shape, crystallinity, and surface composition.…”