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Zero-bias anomaly in the tunneling spectroscopy of high-Tc superconducting films

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/s0921-4534(97)00853-8
Disciplines
  • Physics

Abstract

Abstract The Coulomb staircase structure observed in the tunneling current-voltage characteristics (IVC's) of superconducting YBa 2Cu 3O 7−δ(YBCO) films have been found to exhibit an extra feature of zero-bias anomaly (ZBA), with ΔV 0 ≈4 1.5 ΔV n when the bias voltage exceeded a certain threshold value. Where ΔV 0 and ΔV n (which remains essentially constant) are the widths of the voltage step across zero bias and other higher order steps, respectively. Comparisons made with TlBa 2Ca 2Cu 3O 9±δ(Tl-1223) films under similar conditions indicate that the effects of surface layer polarization might be the primary reason responsible for the ZBA observed in YBCO films.

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