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Investigation of Complex Conductivity of Strongly Disordered Superconducting Films by Broadband Flip-Chip Transmission Line Technique

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In this paper, we numerically and experimentally test the exploitability of the broadband non-contact flip-chip transmission line technique in studying the complex conductivity of ultra-thin, highly disordered superconducting films of… Click to show full abstract

In this paper, we numerically and experimentally test the exploitability of the broadband non-contact flip-chip transmission line technique in studying the complex conductivity of ultra-thin, highly disordered superconducting films of molybdenum carbide. The complex conductivity of such films with various sheet resistances is calculated in the GHz frequency range by the Mattis-Bardeen model with finite broadening parameter Γ and by the Nam model for Dynes superconductors. The transmission of the line in the vicinity of the superconducting thin film is modeled in electromagnetic simulation software, and is compared to experimental data. Evidence of sharp resonances is reported.

Keywords: flip chip; complex conductivity; chip transmission; transmission line

Journal Title: Acta Physica Polonica A
Year Published: 2020

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