YBa₂Cu₃O_7−δ(YBCO)/Bi₂Sr₂CaCu₂O_8+δ(Bi-2212)/YBCO trilayer films with c-axis epitaxial orientation have been successfully prepared on LaAlO₃ (LAO) monocrystalline substrates by sol–gel method using metallic acetates as starting materials. The effect of heat treatment temperature of upper YBCO films on the structure and superconductivity of YBCO/Bi-2212/YBCO planar-type junction have been studied. When the upper YBCO film fabricated at 750 °C, YBCO/Bi-2212/YBCO trilayer films exhibited good in-plane and out-of-plane growth texture and good superconductivity. Two superconducting transition steps in the R–T curves of YBCO/Bi-2212/YBCO trilayer films were clearly observed. Current–voltage (I–V) curves at 50–65 K of trilayer structure exhibit a supercurrent with zero voltage, and the superconducting critical current I_c is proportion to (1 − T⁄T_c)^3.5. We suggest that a weak-link contact, which appears to have an SNSNS type structure, formed at the interface of YBCO/Bi-2212/YBCO trilayer structure.

在LaAlO ₃（LAO）单晶衬底上成功制备了具有c轴外延取向的YBa ₂ Cu ₃ O _7−δ（YBCO）/ Bi ₂ Sr ₂ CaCu ₂ O _{8+ δ}（Bi-2212）/ YBCO三层膜。以金属乙酸盐为起始原料的溶胶-凝胶法。研究了上部YBCO薄膜的热处理温度对YBCO / Bi-2212 / YBCO平面型结的结构和超导性的影响。当在750°C下制造上层YBCO膜时，YBCO / Bi-2212 / YBCO三层膜表现出良好的面内和面外生长纹理以及良好的超导性。R中的两个超导过渡步骤–清晰观察到YBCO / Bi-2212 / YBCO三层膜的T曲线。电流-电压（我- V）在50-65ķ三层结构表现出与零电压的超电流的曲线，和超导临界电流I _{C ^}是比例（1 -  Ť / Ť _Ç）^3.5。我们建议在YBCO / Bi-2212 / YBCO三层结构的界面处形成一个似乎具有SNSNS型结构的弱链接接触。