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Abstract
BaHfO3 (BHO) has been proposed as a new cap layer material for YBa2Cu3O7−δ (YBCO) coated conductors. Highly c-axis oriented BHO cap layer has been deposited on ion-beam assisted deposition-MgO buffered Hastelloy tapes by direct-current-magnetron sputtering method. The epi-growth of BHO films combined with its properties is investigated in details. The degenerated cubic crystal structure of BHO film is confirmed by Raman spectrum analysis. XRD θ–2θ scan, φ-scan and ω-scan reveal an excellent c-axis alignment with good in-plane and out-of-plane textures for BHO cap layers. SEM and AFM investigations show BHO cap layer a dense and crack-free morphology. Subsequently pure c-axis orientation YBCO film was epitaxial grown on such BHO cap layer successfully, shown BaHfO3 a potential cap layer material for coated conductors.
Highlights
Due to their high performance and the potential low cost of both raw materials and preparation techniques, coated conductors based on the high temperature superconductors REBa2Cu3O7−δ (REBCO or RE123; RE = Y, Nd, Sm or other rare earth elements) are expected to be practical materials application at liquid nitrogen temperature
The buffer layers on the metallic substrate have two main functions for coated conductors based on the ion beam assisted deposition (IBAD) technique: (1) to form the texture structure and transfer the texture to the epigrown RE123 superconductor layers; (2) to act as a barrier and prevent Ni or O atoms diffusion during the RE123 processing at high temperature
Different substrate temperatures ranging from 700 to 900 °C were used to evaluate the epitaxial growth of BaHfO3 on IBAD-MgO buffered substrate
Summary
To overcome the weak link behavior of the RE123 grain boundaries and achieve high performance coated conductors, the basic requirement is to realize RE123 films texture on flexible substrates. Main techniques to achieve the required biaxially textured RE123 superconducting layer include the rolling assisted biaxially textured substrates (RABiTS) (Goyal et al 1996; Norton et al 1996; Hühne et al 2007), ion beam assisted deposition (IBAD) (Iijima and Matsumoto 2000; Muroga et al 2003) and inclined substrate deposition (ISD) (Ma et al 2004). Coated conductor architecture includes three layers: the metallic substrate, the buffer layers and the RE123 superconductor layers. The buffer layers on the metallic substrate have two main functions for coated conductors based on the IBAD technique: (1) to form the texture structure and transfer the texture to the epigrown RE123 superconductor layers; (2) to act as a barrier and prevent Ni or O atoms diffusion during the RE123 processing at high temperature. Development of new cap layer material is helpful to understand these influences
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