Preparation of Bi-2212/YBCO heterostructure and their interfacial characters  

作　　者：Minghu Shen Li Lei Gaoyang Zhao Pengrong Ren Mengmeng Ren Man Wu Bo Deng 

机构地区：[1]School of Material Science and Engineering,Xi’an University of Technology,Xi’an,Shaanxi 710048,China [2]Advanced Material Analysis and Test Center,Xi’an University of Technology,Xi’an,Shaanxi 710048,China

出　　处：《Superconductivity》2022年第4期7-13,共7页超导（英文）

基　　金：supported by the National Natural Science Foundation of China(52172273 and 51672212);the Key Science and Technology Program of Shaanxi Province of China(No.2020zdzx04‐04‐02).

摘　　要：YBa_(2)Cu_(3)O_(7‐x)(YBCO)thin films were prepared on LaAlO_(3)(LAO)substrates by a sol–gel method,and the epitaxial growth of Bi‐2212 thin films on YBCO thin films was investigated.Both YBCO and Bi_(2)Sr_(2)Ca1Cu_(2)O_(8)+δ(Bi‐2212)bilayer films exhibit good biaxial texture and superconducting properties.Afterward,a cross‐shaped Bi‐2212/YBCO heterostructure was fabricated,and its interfacial atomic arrangement and I‐V characteristics were analyzed.Atomic‐resolution STEM images obtained from a spherical‐aberration‐corrected transmission electron microscope show that two superconducting films exhibit a layered structure and the atoms inside the films are artfully arranged.Moreover,the order of the seven atomic layers between Bi‐2212 and YBCO layers with a thickness of about 1.32 nm is misarranged.Among them,the Y‐O layer of YBCO and the Sr‐O layer of Bi‐2212 share a CuO_(2) layer.The I‐V curves of Bi‐2212/YBCO bilayer films show that the seven misarranged atomic layers at Bi‐2212/YBCO interface acts as a barrier layer,which means that a Josephson junction can be fabricated using this interface characters.

关 键 词：High‐temperature superconducting thin film Epitaxial growth Lattice mismatch Barrier layer Interface effect 

分 类 号：O462[理学—电子物理学]