Scanning tunneling spectroscopy of a-axis YBa2Cu3O7-δ films: k-selectivity and the shape of the superconductor gap

A. Sharoni*, G. Leibovitch, A. Kohen, R. Beck, G. Deutscher, G. Koren, O. Millo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Tunneling spectroscopy of epitaxial (100) oriented YBa2Cu3O7-δ films was performed using an STM at 4.2 K. On atomically smooth areas, tunneling spectra revealing clear U-shaped gaps with relatively low zero bias conductance were measured. These spectra can be well fitted to the tunneling theory into a d-wave superconductor only when introducinga strong dependence of the tunneling probability on the wave vector k. Possible origins for this k-selectivity in STM measurements will be discussed. On other areas, V-shaped gaps as well as zero bias conductance peaks are observed, indicating relaxation of k-selectivity and the effect of nanofaceting, respectively.

Original languageAmerican English
Pages (from-to)883-889
Number of pages7
JournalEurophysics Letters
Volume62
Issue number6
DOIs
StatePublished - Jun 2003

Fingerprint

Dive into the research topics of 'Scanning tunneling spectroscopy of a-axis YBa2Cu3O7-δ films: k-selectivity and the shape of the superconductor gap'. Together they form a unique fingerprint.

Cite this