Field dependence of Fiske resonances in Nb-AlOx based Josephson junctions


Gijsbertsen, J.G. and Houwman, E.P. and Flokstra, J. and Rogalla, H. and Grand, J.B. le and Korte, P.A.J. de (1993) Field dependence of Fiske resonances in Nb-AlOx based Josephson junctions. IEEE Transactions on Applied Superconductivity, 3 (1, Pa). pp. 2100-2103. ISSN 1051-8223

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Abstract:Fiske resonances have been measured in a rectangular Nb-Al, AlO 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 ¿/4 rad were also measured. Two-dimensional resonant modes have been found. The field dependence of the (1,1) mixed mode agrees well with the theory of M.A.H. Nerenberg et al. (1976)
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Copyright:©1993 IEEE
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Metis ID: 128521