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 language | English |
|---|---|
| Pages (from-to) | 339-344 |
| Number of pages | 6 |
| Journal | Physica C |
| Volume | 183 |
| Issue number | 4-6 |
| DOIs | |
| Publication status | Published - 1991 |
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Houwman, E. P., Gijsbertsen, J. G., Flokstra, J., & Rogalla, H. (1991). On the suppression of the sidelobes of the supercurrent in small Josephson tunnel junctions. Physica C, 183(4-6), 339-344. https://doi.org/10.1016/0921-4534(91)90580-R