We present measurements of the nonlinear surface impedance ZS=RS+iXS of thin-film Nb micro- strip resonators. We demonstrate correlation between material properties of the films and the occurrence of nonlinearity. The nonlinearity is characterized using a dimensionless parameter r={Δ}RS(P)/{Δ}XS(P). We make a short survey of the mechanisms of nonlinear electrodynamics of superconductors and demonstrate that our experimental results are best accounted for by the vortex penetration into the grains.
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Golosovsky et al. (1995) studied this question.
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