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Broadband Microwave Measurements of Overdoped Y0.9Ca0.1Ba2Cu3O7?δ Films Using Corbino Geometry |
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| Authors: | E Farber N Bachar D Lavi H Castro Y-J Chen K H Wu J Y Juang |
| Affiliation: | 1. Laboratory for Superconductivity and Optical Spectroscopy, Ariel University Center of Samaria, Ariel, 40700, Israel 2. School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, 69978, Israel 3. Physics Department, National University of Colombia, Bogota, Colombia 4. Department of Electrophysics, National Chiao Tung University, Hsinchu, 300, Taiwan |
| Abstract: | The surface impedance of Y0.9Ca0.1Ba2Cu3O7?δ thin films was measured using the Corbino spectroscopy method. This special geometry, in which the sample dimensions are well defined by a ring pattern, is ideal for broadband high frequency reflection measurements. Using the complex reflected signal, S 11, measured by a vector network analyzer, one can find the surface impedance of the thin film, from which the complex conductivity can be deduced. In the current work we present the three-standard approach for calibration of the Corbino method and demonstrate the benefits of this approach in measuring superconducting Y0.9Ca0.1Ba2Cu3O7?δ thin films up to 20 GHz and down to 6 K. For the data analysis the well-known generalized two-fluid model was implemented, taking into account a film thickness which is much smaller than the normal state skin depth and superconducting penetration depth. |
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