Abstract
Bi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Sr <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> CaCu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">8+δ</sub> (Bi-2212)/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) and YBCO/Bi-2212 heteroepitaxial bilayer films have been successfully prepared on LaAlO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (LAO) monocrystalline substrates by acetate based photosensitive Sol-Gel method. Two superconducting transition steps in the R-T curves of YBCO/Bi-2212 and Bi-2212/YBCO bilayer films were clearly observed. The first transition step has the superconducting critical transition temperature (Tc) of 90.1-90.8 K and the superconducting transition width (ΔTc) of 2-2.2 K, and these values correspond to the Tc and ΔTc values of YBCO single film. The second transition step has the Tc of 80-84 K and the ΔTc of 4.6-5.2 K, and these values correspond to the Tc and ΔTc values of Bi-2212 single film. XRD results showed that YBCO/Bi-2212 and Bi-2212/YBCO bilayer films grow heteroepitaxially with good in-plane and out-of-plane growth texture.
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