YBCO/LAO和YBCO/MgO超导薄膜的微波性质  

Microwave properties of YBCO/LAO and YBCO/MgO superconducting thin films

作　　者：史力斌[1] 王云飞[2] 柯于洋[2] 张国华[2] 罗胜[2] 张雪强[3] 李春光[3] 黎红[3] 何豫生[3] 

机构地区：[1]渤海大学物理系,锦州121000 [2]北京科技大学应用科学学院,北京100083 [3]中国科学院物理所,北京100080

出　　处：《北京科技大学学报》2007年第11期1128-1132,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No10174006)

摘　　要：利用微带谐振技术研究了YBa2Cu3O7/LaAlO3(YBCO/LAO)和YBa2Cu3O7/MgO(YBCO/MgO)超导薄膜的微波响应.通过测量微带谐振器的共振频率、有载品质因数、插入损耗与温度之间的依赖关系,分析了超导薄膜的微波特性,获得了超导薄膜在绝对零度时的穿透深度λ0.对于YBCO/LAO,λ0=265nm;对于YBCO/MgO,λ0=280nm.本文还利用微带谐振器研究了YBCO/LAO和YBCO/MgO超导薄膜的微波表面电阻.The microwave response of YBa2Cu3OT/LaAlO3 （YBCO/LAO） and YBa2Cu3OT/MgO （YBCO/ MgO） superconducting thin films was studied by microstrip resonator technique. Microwave characteristics of the superconducting films were analyzed by the temperature dependence of resonant frequency, load quality factor and insert loss. The penetration depth at 0 K can be attained as： 20 = 265 nm for YBCO/LAO and 20 = 280 nm for YBCO/MgO. The microwave surface resistance Rs of YBCO/LAO and YBCO/MgO was also investigated by microstrip resonator.

关 键 词：超导薄膜 YBA2CU3O7 LAALO3 MGO 穿透深度 微带谐振器 表面电阻 

分 类 号：TH142.8[一般工业技术—材料科学与工程] TM25[机械工程—机械制造及自动化]