Preparation of EuBCO Epitaxial and Textured Films By F-Free Polymer-assisted Chemical Solution Deposition Method

摘要

Epitaxial and textured EuBa_2Cu_3O_(7-x)(EuBCO) superconductive films were prepared via a F-free polymer-assisted chemical solution deposition (PACSD) method on LaAlO_3 (LAO) single crystal substrate in nitrogen atmosphere. Because of the fluorine-free metal organic system, no harmful gas was produced during processing by the PA-CSD method. The film morphorlogy, phase composition, texture and the superconducting critical temperature (Tc) of EuBCO films were investigated by x-ray diffraction(XRD),Φ-scan, co-scan rocking curves, an environmental scanning electron microscope(ESEM) and four-probe method. The J_c value of the EuBCO film in self-field at 77K was measured by using J_c-scan Leipzig system. The results shoed that a denser microstructure and better biaxial texture EuBCO film after a high temperature treatment with a superconducting critical temperature (Tc) of 91K was obtained . The critical current density (Jc) reached 2.4MA/cm at 77K in the self-field.