Field dependence of Fiske resonances in Nb-AlO/sub x/ based Josephson junctions

Author

Gijsbertsen, J.G. ; Houwman, E.P. ; Flokstra, J. ; Rogalla, H. ; Le Grand, J.B. ; de Korte, P.A.J.

Author_Institution

Twente Univ., Enschede, Netherlands

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

2100

Lastpage

2103

Abstract

Fiske resonances have been measured in a rectangular Nb-Al, AlO/sub x/, Al-Nb Josephson junction as a function of the magnetic field applied parallel to a junction side. Due to the high quality factor of the junction, many resonant modes could be measured, using a special measuring technique. Each mode shows more lobes than reported before. The measured curves are in very good agreement with the high Q theory of I.O. Kulik (1967), and Q-values ranging from 40 to 450 have been obtained. The surface resistance of the Al/Nb barrier probably dominates the microwave losses in the junction barrier at 4.2 K. Losses due to the quasi-particle tunneling current can be neglected. Fiske resonances in a square junction at a field angle of pi /4 rad were also measured. Two-dimensional resonant modes have been found. The field dependence of the

Keywords

Josephson effect; aluminium compounds; cavity resonators; niobium; superconducting junction devices; superconducting microwave devices; type II superconductors; 2D resonant modes; Fiske resonances; Josephson junction; Nb-AlO/sub x/ based junctions; Q-values; field dependence; microwave losses; mixed mode; surface resistance; Electrical resistance measurement; Josephson effect; Josephson junctions; Magnetic field measurement; Magnetic fields; Magnetic resonance; Q factor; Q measurement; Stripline; Surface resistance;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233442

Filename

233442