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

Houwman, E.P. and Gijsbertsen, J.G. and Flokstra, J. and Rogalla, H. (1991) On the suppression of the sidelobes of the supercurrent in small Josephson tunnel junctions. Physica C: Superconductivity, 183 (4-6). pp. 339-344. ISSN 0921-4534

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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.
Item Type:	Article
Copyright:	© 1991 Elsevier Science
Faculty:	Science and Technology (TNW)
Research Group:	Inorganic Materials Science (IMS) Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/24341
Official URL:	http://dx.doi.org/10.1016/0921-4534(91)90580-R
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