Abstract
High-quality epitaxial YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> (YBCO) films were successfully fabricated on LaAlO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (LAO) (001) substrates by fluorine-free metal-organic deposition (MOD). YBCO powder was dissolved into a fluorine-free source to prepare the coating solution. The solution was dip-coated on LAO, dried at 80°C for 10 min, pyrolized at the temperature up to 400°C in humid O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> atmosphere, subsequently fired to produce YBCO in an oxygen partial pressure of 300 ppm, and finally oxygenated in a pure O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> atmosphere at 450°C for 1 h. While, in addition to <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">a</i> -axis oriented grains, the formation of randomly oriented polycrystalline grains was unavoidable when as-pyrolized films were simply fired at 825°C for 2 h, high-quality epitaxial YBCO films with only a small amount of <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">a</i> -axis oriented grains were obtainable when as-pyrolized films were heated up to 850°C at first and then cooled down to 825°C and held for 2 h at the firing stage. Although our best YBCO film had a <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Tc</i> ,zero value of 87.5 K and <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Jc</i> value of 0.47 MA/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> at 77 K in a self-field at the present stage, this fluorine-free MOD is a promising alternative to conventional TFA-MOD since further improvement in <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Jc</i> is possible through the processing optimization.
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