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Homogeneity in the Microwave Surface Resistance of Large YBa 2 Cu 3 O 7−δ Superconductor Films Coated with Au
Electronic Materials Letters ( IF 2.1 ) Pub Date : 2020-04-02 , DOI: 10.1007/s13391-020-00212-5
Woo Il Yang , Sungho Lee , Ho Sang Jung , Hye-Rim Kim , Sang Young Lee

Abstract

We studied homogeneity in the microwave surface resistance of Au-coated YBa2Cu3O7−δ (Au/YBCO) films. The Au/YBCO film with 4-inches in diameter was prepared in-situ with the thicknesses of 68 nm and 365 nm for the Au layer and the YBa2Cu3O7−δ (YBCO) layer, respectively. We measured the effective surface resistance (RS,eff) of the Au/YBCO film at temperatures of 25 K, 60 K, 70 K, and 77 K, respectively, at 29 different positions on the film. The RS,eff values were analyzed with the finite thicknesses of the Au and the YBCO layers taken into consideration. The local RS,eff values of the Au/YBCO film appeared to be almost uniform at 25 K. Meanwhile significant positional dependences were observed for the RS,eff of the Au/YBCO film at 60 K, 70 K and 77 K, respectively, which seemed to be due to non-uniform local penetration depth (λ) of the YBCO layer rather than due to variations in the local real-part conductivity of the YBCO layer. The observed results could not be attributed to the properties of the Au layer. At temperatures below the critical temperature of YBCO, the observed RS,eff values of the Au/YBCO film were significantly lower than those estimated using the surface resistance of Au and YBCO, which reflected proximity effects of the normal-metal Au layer in contact with the superconducting YBCO layer. Homogeneity in the RS,eff of the Au/YBCO film might be correlated with the distributions in the local λ of the YBCO layer, providing valuable information needed for designing microwave filters.

Graphic Abstract



中文翻译:

涂金的大型YBa 2 Cu 3 O7-δ超导薄膜的微波表面电阻均质性

摘要

我们在金涂覆的YBa的微波表面电阻均匀性研究2的Cu 3 ö 7-δ(AU / YBCO)膜。用直径为4英寸的金/ YBCO薄膜在原位制备的68 nm和Au层和所述的YBa 365nm的厚度2的Cu 3 ö 7-δ(YBCO)层,分别。我们分别在25 K,60 K,70 K和77 K的温度下在膜上的29个不同位置测量了Au / YBCO膜的有效表面电阻(R S,eff)。的[R S,EFF值与Au构成的有限厚度和考虑到YBCO层进行分析。本地R S,effAu / YBCO薄膜在25 K时的值似乎几乎是均匀的。与此同时 Au / YBCO薄膜在60 K,70 K和77 K时的R S,eff的显着位置相关性也很明显。这是由于YBCO层的局部穿透深度(λ)不均匀,而不是由于YBCO层的局部实部电导率变化所致。观察到的结果不能归因于Au层的性质。在低于YBCO临界温度的温度下,观察到的R S,effAu / YBCO膜的阻值明显低于使用Au和YBCO的表面电阻估计的值,这反映了普通金属Au层与超导YBCO层接触的邻近效应。Au / YBCO膜的Rs ,eff的均质性可能与YBCO层的局部λ中的分布相关,为设计微波滤波器提供了有价值的信息。

图形摘要

更新日期:2020-04-02
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