Zero bias anomalies in YBa2Cu3O7 tunnel junctions

J. Lesueur, Laura Greene, W. L. Feldmann, A. Inam

Research output: Contribution to journalArticlepeer-review


Reproducible planar tunnel junctions based on high-quality YBa2Cu3O7 thin films are studied as a junction of crystallographic orientation. Using Pb as a counter-electrode, all junctions exhibit zero bias anomalies, the sign of which depends upon the crystallographic orientation of the film. For c-axis, or (001) films, in which the CuO2 planes are parallel to the junction surface, a 5 mV wide dip in the tunneling conductance, which is independent of applied magnetic field up to 5 T, is observed. Conversely, for the (103) and (100) orientations, in which the CuO2 plane points toward the junction surface, a peak in the tunneling conductance, which is strongly magnetic-field dependent, is observed. Analysis is performed in terms of spin-flip and Kondo-type scattering at the interface (Anderson and Applebaum theory).

Original languageEnglish (US)
Pages (from-to)325-332
Number of pages8
JournalPhysica C: Superconductivity and its applications
Issue number3-4
StatePublished - Feb 15 1992

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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