Microwave Fabry-Pérot Transmission through YBaCuO Superconducting Thin Films

Abstract

Transmission measurements of 35 GHz microwaves through two 200 nm YBaCuO films are performed in the temperature range between 7 and 100 K. The films are facing each other parallel in such a way that resonant Fabry-P\'erot transmission is made possible. From the amplitude and the frequency width of the resonance, the values of the London penetration depth and the Ohmic losses are obtained independently for the first time in an absolute way over the whole temperature range below ${T}_{c}$.