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首页> 外文期刊>Journal of Superconductivity >Two-Peak Temperature Dependence of Microwave Surface Impedance of Single-Crystalline YBCO Thin Films: Role of Pairing Symmetry and Defect Structure
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Two-Peak Temperature Dependence of Microwave Surface Impedance of Single-Crystalline YBCO Thin Films: Role of Pairing Symmetry and Defect Structure

机译：单晶YBCO薄膜的微波表面阻抗的两峰温度依赖性：配对对称性和缺陷结构的作用

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摘要

Temperature dependencies of microwave surface impedance were measured for c-oriented highly perfect YBCO thin films deposited by off-axis dc magnetron sputtering onto CeO{sub}2-buffered r-cut sapphire substrates. A distinct two-peak structure of R{sub}s(T) and X{sub}s(T) dependencies with peaks at 28-30 K and 50 K has been revealed. The peaks become smeared at higher frequencies or in applied dc magnetic field, while the peak positions remain almost unchanged. The two-peak Z{sub}s(T) behavior is believed to be an intrinsic electron property of extremely perfect quasi-single-crystalline YBCO films. A theoretical model is suggested to explain the observed anomalous Z{sub}s{T) behavior. The model is based on the Boltzman kinetic equation for quasiparticles in layered high-T{sub}c superconductors (HTS) cuprates. It takes into account the supposed s + d wave symmetry of electron pairing and strong energy-dependent relaxation time of quasiparticles, determined mainly by their elastic scattering on extended defects parallel to the c-axis.
机译：测量了通过离轴直流磁控溅射在CeO {sub} 2缓冲r割蓝宝石衬底上沉积的c取向高度完美YBCO薄膜的微波表面阻抗的温度依赖性。已经揭示了R {sub} s（T）和X {sub} s（T）依存关系的独特的两峰结构，其峰值位于28-30 K和50K。峰值在较高频率或施加的直流磁场中变得模糊不清，而峰值位置几乎保持不变。人们认为，两峰Z {sub} s（T）行为是极其完美的准单晶YBCO薄膜的固有电子性质。建议使用理论模型来解释观测到的异常Z {sub} s {T）行为。该模型基于层状高T {sub} c超导体（HTS）铜酸盐中准粒子的Boltzman动力学方程。它考虑了假定的电子对的s + d波对称性和准粒子的强能量依赖的弛豫时间，这主要取决于准粒子在平行于c轴的扩展缺陷上的弹性散射。

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