Browsing by Author "Castro, H."

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Broadband Microwave Measurements of Overdoped Y0.9Ca0.1Ba2Cu3O7-delta Films Using Corbino Geometry
(2013-04-01)
Farber, E.
;
Bachar, N.
;
Lavi, D.
;
Castro, H.
;
Chen, Y. -J.
The surface impedance of Y0.9Ca0.1Ba2Cu3O7-delta 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-delta 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.