Specific capacitance of Nb/Al-AlN/Nb superconducting tunnel junctions
Paper in proceeding, 2019

Modern radio astronomy demands for broadband receiver systems. For SIS mixers, this translates into objective to employ superconducting tunnel junctions with a very low RnA and low specific capacitance. The traditionally used Nb/AlOx/Nb junctions have largely approached their physical limit of
minimizing those parameters. It is commonly recognized that it is AlN-barrier junctions, which are needed for further progressing of the broadband SIS mixer instrumentation for radio astronomy. In this work, we present the progress in fabrication of high quality Nb/Al-AlN/Nb superconducting tunnel (SIS) junctions and their characterization in terms DC electric properties junctions’ specific capacitance.

SIS

Nb/Al-AlN/Nb

Author

Alexey Pavolotskiy

Chalmers, Space, Earth and Environment, Onsala Space Observatory, GARD Technology

Cristian Daniel López

Chalmers, Space, Earth and Environment, Onsala Space Observatory, GARD Technology

Isabel Vrethed Tidekrans

Chalmers, Space, Earth and Environment, Onsala Space Observatory, GARD Technology

Denis Meledin

Chalmers, Space, Earth and Environment, Onsala Space Observatory, GARD Technology

Vincent Desmaris

Chalmers, Space, Earth and Environment, Onsala Space Observatory, GARD Technology

Victor Belitsky

Chalmers, Space, Earth and Environment, Onsala Space Observatory, GARD Technology

ISSTT Proceedings by NRAO

30th International Symposium on Space THz Technology (ISSTT2019)
Gothenburg, Sweden,

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4/16/2021