Measurement of YBCO Thin Film Surface Resistance Using Coplanar Line Resonator Techniques From 20 MHz to 20 GHz

Author

Wang, Yi ; Su, Hieng Tiong ; Huang, Frederick ; Lancaster, Michael J.

Author_Institution

Univ. of Birmingham, Birmingham

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

3632

Lastpage

3639

Abstract

The surface resistances of YBCO thin films are measured over a wide and continuous frequency range from 20 MHz to 20 GHz, by characterizing more than 1000 harmonics of two 20 MHz high-temperature superconductor resonators. One resonator is based on the conventional coplanar waveguide (CPW) and the other based on the conductor-backed CPW (CBCPW). The quality factors and resonant frequencies are measured. The attenuation and group-delays of the coplanar lines are estimated and surface resistances of the superconductors are extracted using a transmission-line model. The wideband frequency-dependence of the surface resistance is investigated. The sources of experimental errors are analyzed. This paper also reports some temperature-dependent and power-dependent measurement results.

Keywords

barium compounds; high-temperature superconductors; superconducting resonators; yttrium compounds; YBCO thin film; YBa₂Cu₃O₇; attenuation; coplanar line resonator technique; coplanar waveguides; frequency 20 MHz to 20 GHz; group-delays; high-temperature superconductors; surface resistance; Coplanar waveguides; Electrical resistance measurement; Frequency measurement; High temperature superconductors; Q factor; Resonant frequency; Superconducting thin films; Surface resistance; Transistors; Yttrium barium copper oxide; Coplanar transmission lines; high-temperature superconductors; microwave measurements; resonators;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.899369

Filename

4278315