Artificial grain boundary Josephson junctions : properties and applications

Ivanov, Z.G., Alarco, J.A., Claeson, T., Nilsson, P.aaA, Olsson, E., Olsson, H.K., Stepantsov, E.A., Tzalenchuk, A.Ya, & Winkler, D. (1993) Artificial grain boundary Josephson junctions : properties and applications. In Proceedings of the Beijing International Conference : High Temperature Superconductivity (BHTSC '92). World Sci, p. 722.

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Engineered grain boundary Josephson junctions in YBaCuO were formed on bicrystal Y-ZrO2 substrates. Laser deposited films were patterned into micron size microbridges. The authors obsd. a pronounced correlation between superconducting transport properties of grain boundary junctions and the misorientation angle θ between the two halves of the bicrystal. The crit. Josephson current Ic decreased about four orders of magnitude as θ was increased from 0 to 45 degrees. Clear microwave and magnetic field responses were obsd. at 77 K. At this temp., crit. current times normal resistance products, IcRn, of up to 1 mV were measured for low angle grain boundaries, and Shapiro steps were obsd. up to that voltage. DC SQUIDs were fabricated, and best performance at 77 K was obtained for θ = 32° with a 4-μm strip width. To utilize the higher IcRn value of a lower θ, submicron junctions have to be developed. [on SciFinder(R)]

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ID Code: 64075
Item Type: Book Chapter
Additional Information: CAPLUS AN 1994:336328(Conference)
Keywords: grain boundary Josephson junction cuprate superconductor, yttrium barium cuprate Josephson junction, yttria stabilized zirconia substrate Josephson junction, bicrystal zirconia substrate Josephson junction
Divisions: Current > Institutes > Institute for Future Environments
Deposited On: 06 Nov 2013 23:02
Last Modified: 06 Nov 2013 23:03

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