Abstract
The electrophysical properties of heterojunctions several microns in size, obtained by successive deposition of the metal-oxide high-temperature superconductor YBa2Cu3Ox, a normal metal Au, and the low-temperature superconductor Nb, were studied experimentally. Current flows in the [001] direction of the epitaxial YBa2Cu3Ox film. It is shown, by comparing the experimental data with existing theoretical calculations, that for the experimentally realizable transmittances (D̄=10−5–10−6) of the YBa2Cu3Ox—normal metal boundary the critical current of the entire heterostructure is low (of the order of the fluctuation current) because of a sharp change in the amplitude of the potential of the superconducting carriers at this boundary. The current-voltage characteristics of the heterostructure studied correspond to tunnel junctions consisting of a superconductor with \(d_{x^2 - y^2 } \) type symmetry of the superconducting wave function and a normal metal.
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Zh. Éksp. Teor. Fiz. 116, 2140–2149 (December 1999)
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Komissinskii, F.V., Ovsyannikov, G.A., Tulina, N.A. et al. Current transport along the [001] axis of YBCO in low-temperature superconductor-normal metal-high-temperature superconductor heterostructures. J. Exp. Theor. Phys. 89, 1160–1165 (1999). https://doi.org/10.1134/1.559066
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DOI: https://doi.org/10.1134/1.559066