Field-dependent nonlinear surface resistance and its optimization by surface nanostructuring in superconductors
Field-dependent nonlinear surface resistance and its optimization by surface nanostructuring in superconductors
We propose a theory of nonlinear surface resistance of a dirty superconductor in a strong radio-frequency (rf) field, taking into account magnetic and nonmagnetic impurities, finite quasiparticle lifetimes, and a thin proximity-coupled normal layer characteristic of the oxide surface of many materials. The Usadel equations were solved to obtain the …