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

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.

Abstract: The microwave response of YBa₂Cu₃O₇/LaAlO₃ (YBCO/LAO) and YBa₂Cu₃O₇/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:λ₀=265 nm for YBCO/LAO and λ₀=280 nm for YBCO/MgO. The microwave surface resistance Rs of YBCO/LAO and YBCO/MgO was also investigated by microstrip resonator.