Tunnel junctions using oxide superconducting thin films epitaxially grown on SrTiO3

26 December 1988

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 53 (26) , 2689-2691
https://doi.org/10.1063/1.100546

Abstract

Normal‐metal/insulator/superconductor (NIS) junctions were fabricated using thin films of YBa₂Cu₃O_7−x (YBCO) or ErBa₂Cu₃O_7−x. These were epitaxially grown on single‐crystal SrTiO₃ by the activated reactive evaporation method. For some NIS junctions prepared on SrTiO₃ (110) substrates, we observed multipeaks in the differential conductance versus voltage curve. NIS junctions using single‐crystal YBCO films on SrTiO₃ (100) showed a set of peaks, from which we obtained a gap parameter of 11.5±1.5 meV at 4.4 K and a coupling constant of 3.2±0.4.

Keywords

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