In high frequency applications of superconductors, a relevant parameter used to synthetically describe their performances in terms of surface resistance (proportional to power losses) dependence on the operating frequency is the so-called pinning frequency νp. Customarily, high sensitivity resonant techniques, intrinsically operating at discrete frequencies, are used to estimate νp. By exploiting a dual frequency resonator, we show here that the inaccurate evaluation of νp in the common approach based on single-frequency measurements leads to heavy underestimations of the superconductor surface resistance.
Pompeo, N., Torokhtii, K., Alimenti, A., Silva, E. (2020). Dual frequency resonator for the correct determination of the in-field surface impedance frequency dependence of superconductors. In 24th IMEKO TC-4 INTERNATIONAL SYMPOSIUM PROCEEDINGS (pp.75-79).