Measurements of the Riedel peak in superconducting aluminum tunnel junctions (mixers)

Author

Winkler, D.

Author_Institution

Dept. of Phys., Chalmers Univ. of Technol., Goteborg, Sweden

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

2234

Lastpage

2237

Abstract

The Riedel singularity in thin-film aluminum tunnel junctions was measured from temperature behavior of the zero voltage step and the RF-induced Josephson steps at around the gap frequency. From these experiments the author derived a value of the imaginary gap parameter to be about 1% of the gap parameter value at the gap edge when the temperature was 0.7 of the transition temperature. The author believes that, using magnetic field for tuned superconductor-insulator-superconductor (SIS) mixers with relatively large area, the Riedel singularity should not play an important role for frequencies around the gap frequency at finite temperatures.<>

Keywords

Josephson effect; aluminium; microwave detectors; mixers (circuits); quasi-particles; receivers; submillimetre wave devices; superconducting junction devices; superconducting microwave devices; type I superconductors; Al tunnel junction; RF-induced Josephson steps; Riedel peak; Riedel singularity; gap frequency; imaginary gap parameter; superconducting junctions; superconductor-insulator-superconductor mixers; temperature behavior; zero voltage step; Aluminum; Frequency measurement; Josephson junctions; Magnetic fields; Radio frequency; Superconducting devices; Superconducting thin films; Superconducting transition temperature; Temperature measurement; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233560

Filename

233560