Influence of oxygen pressure on critical current density and magnetic flux pinning structures in YBa2Cu3O7−x fabricated by chemical solution deposition

Abstract

This paper studies the effect of oxygen partial pressure on the fabrication of YBa2Cu3O7−x films on (00l) LaAlO3 substrates by metalorganic deposition using trifluoroacetates (TFA-MOD). As the oxygen partial pressure increases to 1500 Pa, a great increase in the superconducting properties is observed at high magnetic fields parallel to the YBCO c axis. The cross-sectional transmission electron microscope images show that a high density of stacking faults in the size range of 10–15 nm may act as flux pinning centres to enhance the critical current density of the YBCO films