Improvement in short-circuited coaxial flange for evaluating microwave superconducting properties at low temperature

Indian Journal of Pure & Applied Physics

article

Sandhya M Patel¹  Yogita Kalra¹  V N Ojha²  R K Sinha¹ 

[1] TIFAC-CORE in Fibre Optics and Optical Communication, Department of Applied Physics, Delhi Technological University;Time and Frequency and Electrical and Electronics Metrology, CSIR-National Physical Laboratory;Academy of Scientific and Innovative Research, CSIR- National Physical Laboratory;Central Scientific Instruments Organisation

关键词: Thin superconductor film;    Surface impedance;    Microwave conductivity;    Skin depth;    Article;   

来源: National Institute of Science Communication and Information Resources

【 摘 要 】

In the present study, we have proposed an improvement in terms of the determination of S-parameters of an open flange from its characteristic impedance and propagation constant. With the help of these S-parameters, the actual reflection coefficient of YBCO films deposited on LAO substrate is obtained from the measured reflection coefficient. The surface impedance of three YBCO films is obtained in the range of few ohms in the frequency range from 1 GHz to 40 GHz. The surface resistance of the films reduces at liquid nitrogen temperature, i.e., 77 K, whereas, the surface reactance slightly increases due to kinetic inductance. The conductivity and skin depth are also determined to validate the improvement in the method.

【 授权许可】

Unknown