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

R. T. Kao*, S. J. Wang, Jenh-Yih Juang, Kaung-Hsiung Wu, T. M. Uen, Y. S. Gou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The Coulomb staircase structure observed in the tunneling current-voltage characteristics (IVC's) of superconducting YBa 2 Cu 3 O 7-δ (YBCO) films have been found to exhibit an extra feature of zero-bias anomaly (ZBA), with ΔV 0 ≈ 1.5ΔV 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 2 Ca 2 Cu 3 O 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.

Original languageEnglish
Pages (from-to)1493-1494
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume282-287
Issue numberPART 3
DOIs
StatePublished - Aug 1997

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