Abstract
We have studied symmetric bicrystal Josephson junctions of a new type based on metal oxide superconductors in which the base planes are misoriented relative to the [100] direction by an angle within 22°–28°. These junctions exhibit record high values of the critical parameters at T = 77 K: the critical current density reaches I C = (2−5) × 105 A/cm2 and the characteristic voltage is V C = I C R N = 0.6−0.9 mV. The properties of the new junctions have been determined for the first time under the influence of monochromatic microwave radiation in the millimeter wavelength range and have been studied as functions of the magnetic field and temperature. The observed dependences of the critical current and the Shapiro step height on the electromagnetic field amplitude agree well with the theoretical predictions according to the resistive shunted junction model of the Josephson junction. The new junctions can be used in real superconducting devices operating at liquid nitrogen temperatures.
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Translated from Pis’ma v Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 31, No. 8, 2005, pp. 38–46.
Original Russian Text Copyright © 2005 by Borisenko, Shadrin, Ovsyannikov, Kotelyanskii, Komissinski.
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Borisenko, I.V., Shadrin, A.V., Ovsyannikov, G.A. et al. Josephson parameters of bicrystal junctions of a new type based on metal oxide semiconductors. Tech. Phys. Lett. 31, 332–335 (2005). https://doi.org/10.1134/1.1920388
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DOI: https://doi.org/10.1134/1.1920388