Investigation of Complex Conductivity of Strongly Disordered Superconducting Films by Broadband Flip-Chip Transmission Line Technique |
| P. Neilingera, M. Baráneka, D. Mancaa, M. Grajcara, b
aDepartment of Experimental Physics, Comenius University, SK-84248 Bratislava, Slovakia bInstitute of Physics, Slovak Academy of Sciences, Dúbravská cesta, Bratislava, Slovakia |
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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 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. |
DOI:10.12693/APhysPolA.137.797 topics: disordered superconductor, Dynes superconductor, complex conductivity |