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Reproducible tunneling characteristics and zero-bias anomalies in YBaCuO tunnel junctions

✍ Scribed by A.M. Cucolo; R. Di Leo; F. Licci

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
449 KB
Volume
192
Category
Article
ISSN
0921-4534

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✦ Synopsis

We have investigated interfaces between chemically etched YBa2CugOT_, single cry. stals and evaporated thin films of different materials by means of planar tt and junctions with natural barriers. We have found that reproducible tunneling characteristics are obtained with Au, Bi and Sb counterclectrodes. Evidence for the local 1~ of the Y-Ba-Cu-O compound is observed in these junctions. Less pronounced structures are found in the case of Sn counterelectrodes while Ag and A1 junctions develop a large resistance peak at zero bias and low temperatures.

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Tunnel junctions on 1:2:4 YBaCuO sing
Tunnel junctions on 1:2:4 YBaCuO single crystal
✍ P. Romano; R. Di Leo; A.M. Cucolo; A. Nigro; B. Dabrowski; P.G. Radaelli 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 168 KB

We have studied the 1:2:4 phase of the Y-Ba-Cu-O compound by means of tunneling spectroscopy on single crystal based junctions. The crystals, with Tc-80 K, have been chemically etched before the deposition of the counterelectrode in form of a thin film through a metallic mask. We have compared the t