Current transport along the [001] axis of YBCO in low-temperature superconductor-normal metal-high-temperature superconductor heterostructures |
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Authors: | F V Komissinskii G A Ovsyannikov N A Tulina V V Ryazanov |
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Institution: | (1) Institute of Radio Engineering and Electronics, Russian Academy of Sciences, 103907 Moscow, Russia;(2) M. V. Lomonosov Moscow State University, 119899 Moscow, Russia;(3) Institute of Solid-State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia |
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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
type symmetry of the superconducting wave function and a normal metal.
Zh. éksp. Teor. Fiz. 116, 2140–2149 (December 1999) |
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