Abstract
In this paper, a Eu0.6Sr0·4BiO3 (ESBO) film with self-assembled SrO2 nanodots was fabricated on a (00l) LaAlO3 (LAO) substrate by a self-developed polymer-assisted chemical solution deposition (PA-CSD) process. A highly epitaxial 450 nm YBa2Cu3O7−x (YBCO) thin film was successfully fabricated on the ESBO/LAO. The YBCO films and buffers were studied with XRD, ESEM, TEM and M − H hysteresis loop analysis, and it was found that the ESBO film can be thought of as a monolithic two-phase composite structure with self-assembled SrO2 nanoparticles, which were formed on the ESBO surface after heat treatment. The YBCO epitaxial coating on the ESBO exhibited a very robust dependence of Jc on the magnetic field. Cross-sectional TEM analysis confirmed that the SrO2 surface nanoparticles caused defects in the YBCO film, resulting in a strong pinning effect on the flux vortex line. The YBCO film grown on the ESBO/LAO produced an approximately 40% increase in Jc compared with that of the control YBCO sample at a low applied magnetic field. Our results illustrate the effectiveness of the simple and low-cost route for achieving high-performance YBCO-coated conductors based on a multifunctional ESBO buffer layer.
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