On the suppression of the sidelobes of the supercurrent in small Josephson tunnel junctions

E.P. Houwman, J.G. Gijsbertsen, J. Flokstra, H. Rogalla

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Abstract

The critical currents of Nb/Al, Al-oxide, Al/Nb tunnel junctions of various shapes have been measured as a function of the applied magnetic field. For the square junction and for some special shapes like the diamond, ¿1 + cosine¿ and quartic junctions the Ic(B) pattern falls off theoretically as 1/Bn, with n respectively equal to 1, 2, 3 and 4. In general the measurements are in good agreement with the theoretical predictions. For the "1 + cosine" and quartic shapes we found a sidelobe suppression that is even larger than that obtained in theory. For the quartic junction the first sidelobe is only 0.3% of the zero-field current. An Ic(B) modulation with a small, only slowly decreasing amplitude is observed for the diamond, "1 + cosine", and quartic junctions, that can be explained by rounding of the sharp edges of the junction shapes, due to the fabrication process.
Original languageEnglish
Pages (from-to)339-344
Number of pages6
JournalPhysica C
Volume183
Issue number4-6
DOIs
Publication statusPublished - 1991

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