Microwave Admittance of Gold-Palladium Nanowires with Proximity-Induced Superconductivity

Abstract

We report quantitative electrical admittance measurements of diffusive superconductor--normal-metal--superconductor (SNS) junctions at gigahertz frequencies and millikelvin temperatures. The gold-palladium-based SNS junctions are arranged into a chain of superconducting quantum interference devices. The chain is coupled strongly to a multimode microwave resonator with a mode spacing of approximately 0.6 GHz. By measuring the resonance frequencies and quality factors of the resonator modes, we extract the dissipative and reactive parts of the admittance of the chain. We compare the phase and temperature dependence of the admittance near 1 GHz to theory based on the time-dependent Usadel equations. This comparison allows us to identify important discrepancies between theory and experiment that are not resolved by including inelastic scattering or elastic spin-flip scattering in the theory.

8 pages, 6 figures

References in corpus (7)

• Phase controlled superconducting proximity effect probed by tunneling spectroscopy
• Improving the Quality Factor of Microwave Compact Resonators by Optimizing their Geometrical Parameters
• Density of states and supercurrent in diffusive SNS junctions: role of nonideal interfaces and spin-flip scattering
• Theory of Microwave-Assisted Supercurrent in Diffusive SNS Junctions
• Linear AC Response of Diffusive SNS Junctions
• Admittance of a long diffusive SNS junction
• Dephasing of Cooper pairs and subgap electron transport in superconducting hybrids

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