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We investigate the low-frequency electrodynamics in the vortex state of twotype-II superconducting films, namely, a moderate-to-strongly pinned NiobiumNitride (NbN) and a very weakly pinned amorphous Molybdenum Germanium (a-MoGe).We employ a two-coil mutual inductance technique to extract the complexpenetration depth, $\tilde{\lambda}$. The sample response is studied throughthe temperature variation of $\tilde{\lambda}$ in the mixed state, where weemploy a model developed by Coffey and Clem (CC model) to extract the differentvortex lattice (VL) parameters such as the restoring pinning force constant(Labusch parameter), VL drag coefficient and pinning potential barrier. Weobserve that a consistent description of the inductive and dissipative part ofthe response is only possible when we take the viscous drag on the vortices tobe several orders of magnitudes larger than viscous drag estimated from theBardeen-Stephen model.

Low frequency electrodynamics in the mixed state of superconducting NbN and a-MoGe films using two-coil mutual inductance technique