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

Russell E. Lake*, Joonas Govenius, Roope Kokkoniemi, Kuan Yen Tan, Matti Partanen, Pauli Virtanen, Mikko Möttönen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
129 Downloads (Pure)

Abstract

Quantitative electrical admittance measurements of diffusive superconductor-normal-metal-superconductor (SNS) junctions at gigahertz frequencies and millikelvin temperatures are reported. 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, the dissipative and reactive parts of the admittance of the chain are extracted. The phase and temperature dependence of the admittance near 1 GHz are compared with theory based on the time-dependent Usadel equations. This comparison allows the identification of important discrepancies between theory and experiment that are not resolved by including inelastic scattering or elastic spin-flip scattering in the theory.

Original languageEnglish
Article number1600227
Pages (from-to)1-8
JournalAdvanced Electronic Materials
Volume3
Issue number6
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • Electrical admittance
  • Microwave circuits
  • Nanoelectronic devices
  • SNS junctions
  • Superconducting proximity effects

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