Manipulation of YBCO film properties by the introduction of perovskite BaTiO3 nanodots as substrate decorations

2016 
Abstract Perovskite BaTiO 3 (BTO) nanodots were deposited on LaAlO 3 (LAO) substrates using the BTO precursor solutions with various low concentrations. Subsequently, YBa 2 Cu 3 O 7-x (YBCO) superconducting films were deposited on the BTO-dots decorated LAO substrates through a low-fluorine solution method. High BTO dots (with heights of 30–50 nm) and short BTO nanodots (with heights less than 30 nm) were produced using a solution with a concentration of 0.025 mol/L, which could not be produced using solutions of other concentrations. We found a significantly enhanced flux pining force in the YBCO film deposited on the BTO-dots decorated LAO substrate. Because of the joint pinning effect of the high BTO dots and short BTO dots, the high-performance YBCO film with a critical current density of 8.42 MA/cm 2 and a flux pinning force of 9.58 GN/m 3 was produced on the LAO substrate.
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