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arxiv: cond-mat/9903065 · v1 · submitted 1999-03-03 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci

c-axis Tunneling in Nb/Au/YBaCuO Structures

P.V.Komissinski(1) , G.A.Ovsyannikov(1) , N.A.Tulina(2) , V.V.Ryazanov(2) ((1) Institute of Radio Engineering , Electronics RAS , Moscow , Russia , (2) Institute of Solid State Physics
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Chernogolovka Russia)
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classification ❄️ cond-mat.supr-con cond-mat.mtrl-sci
keywords interfaceybacuocurrentexperimentalstructurescriticalmagnituderesistance
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We present the experimental results for Nb/Au/YBaCuO structures, in which the current flows along (001) direction of YBaCuO film. The theoretical evaluations show, that at the experimental values of the Au/YBaCuO interface transparency, determined from the interface resistance D~10^-6, the critical current of the structure is of the fluctuation order of magnitude due to the sharp decrease of the amplitude potential of the superconducting carriers on this interface. Obtained I-V-curves could be interpreted in terms of contact between d-type pairing superconductor or gapless isotropic superconductor with normal metal. No critical current was observed for investigated structures with characteristic interface resistance RnS~10^-6 Ohm cm^2, 2 orders of magnitude lower, than for known experimental data. PACS: 74.50.+r, 74.72.Bk

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