Structure and properties of deposited films in composite samples SiO$_{2}$/YSZ/CeO$_{2}$/YBa$_{2}$Cu$_{3}$O$_{y}$

A composite superconductor SiO$_{2}$/YSZ/CeO$_{2}$/YBa$_{2}$Cu$_{3}$O$_{y}$ with a critical current density of 7 $\times$ 10$^4$ A/cm$^2$ has been prepared by laser ablation. Small hills enriched in copper and oxygen on the surface of the deposited films have been detected using scanning electron microscopy. A grain structure (sizes of 0.2–0.3 $\mu$m) and a system of twins $\sim$400 $\mathring{\mathrm{A}}$ in width have been detected in the superconducting film using transmission electron microscopy. Such a structure and high (001) texture of the film provide the noted critical current density.