Evidence for Two Time Scales in Long SNS Junctions

Abstract

We use microwave excitation to elucidate the dynamics of long superconductor / normal metal / superconductor Josephson junctions. By varying the excitation frequency in the range 10 MHz - 40 GHz, we observe that the critical and retrapping currents, deduced from the dc voltage vs. dc current characteristics of the junction, are set by two different time scales. The critical current increases when the ac frequency is larger than the inverse diffusion time in the normal metal, whereas the retrapping current is strongly modified when the excitation frequency is above the electron-phonon rate in the normal metal. Therefore the critical and retrapping currents are associated with elastic and inelastic scattering, respectively.

References in corpus (2)

• Proximity DC squids in the long junction limit
• Origin of Hysteresis in a Proximity Josephson Junction

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• Nonadiabatic Dynamics of Strongly Driven Diffusive Josephson Junctions
• Admittance of a long diffusive SNS junction
• The discovery, disappearance and re-emergence of radiation-stimulated superconductivity
• Microwave Admittance of Gold-Palladium Nanowires with Proximity-Induced Superconductivity
• Dynamical I-V Characteristics of SNS Junctions
• Quasiparticle and superfluid dynamics in Magic-Angle Graphene
• Nonlinear Resonance of Superconductor/Normal Metal Structures to Microwaves