Ag基底织构和表面状况对YBCO薄膜性能的影响

采用MOD方法在三种不同织构和表面状态的Ag基底上制备了YBCO薄膜,研究了Ag基底的织构和表面状态对YBCO超导薄膜的影响.在真空中退火的Ag基底上沉积的YBCO薄膜仅有c轴取向,且薄膜表面有很多平行条纹,薄膜的连接性不好,J_c不高;在氩气气氛中退火的Ag基底上沉积的YBCO薄膜,具有很强的c轴取向和良好的面内织构,J_c相对较高为1.2×10⁴A/cm²;冷轧Ag基底沉积的YBCO薄膜织构没有氩气退火的Ag基底上的强,但薄膜的表面平整,连接性好,临界电流密度最高为1.5×10⁴A/cm².

Influence of Ag Substrate Textures and Surface Condition on Properties of YBCO Film

In order to study the influence of the texture and surface morphology of Ag substrates on the YBCO film properties, YBCO films were deposited on three different Ag substrates. The YBCO film deposited on Ag substrate annealed in vacuum has a poor texture and low J_c. in addition, the film is loose and unconnected. The YBCO films deposited on Ag substrate annealed in Ar atmosphere have strong c biaxial texture and higher J_c 1.2×10⁴A/cm². The texture of YBCO film deposited on the cold rolled Ag substrate is not as strong as the texture of the film deposited on Ag substrate annealed in Ar atmosphere. Due to its smooth surface, the YBCO film deposited on the cold rolled Ag substrate still has higher J_c of 1.5×10⁴A/cm².