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We explore the behavior of the ac admittance of superconductor-normalmetal-superconductor (SNS) junctions as the phase difference of the orderparameters between the superconductors is varied. We find three characteristicregimes, defined by comparing the driving frequency $\omega$ to the inelasticscattering rate $\Gamma$ and the Thouless energy $E_T$ of the junction(typically $\hbar\Gamma \ll E_T$). Only in the first regime $\omega \ll \Gamma$the usual picture of the kinetic inductance holds. We show that the acadmittance can be used to directly access some of the characteristic quantitiesof the SNS junctions, in particular the phase dependent energy minigap and thetypically phase dependent inelastic scattering rate. Our results partiallyexplain the recent measurements of the linear response properties of SNSSuperconducting Quantum Interference Devices (SQUIDs) and predict a number ofnew effects.

Linear AC Response of Diffusive SNS Junctions