Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-04-22
Applied Surface Science 256 (2010) 5684-5687
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
To be published in Applied Surface Science.
Scientific paper
Current-voltage characteristics of planar junctions formed by an epitaxial c-axis oriented YBa2Cu3O7-x thin film micro-bridge and Ag counter-electrode were measured in the temperature range from 4.2 K to 300 K. A hysteretic behavior related to switching of the junction resistance from a high-resistive to a low-resistive state and vice-versa was observed and analyzed in terms of the maximal current bias and temperature dependence. The same effects were observed on a sub-micrometer scale YBa2Cu3O7-x thin film - PtIr point contact junctions using Scanning Tunneling Microscope. These phenomena are discussed within a diffusion model, describing an oxygen vacancy drift in YBa2Cu3O7-x films in the nano-scale vicinity of the junction interface under applied electrical fields.
Belogolovskii Mikhail
Chromik Stefan
Kus Peter
Noskovic Jaroslav
Plecenik Andrej
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