Correlation of tunneling spectra with surface nanomorphology and doping in thin YBa2Cu3O7-δ films

A. Sharoni*, G. Koren, O. Millo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Tunneling spectra measured on thin epitaxial YBa2Cu3O7-δ films are found to exhibit strong spatial variations, showing U-and V-shaped gaps as well as zero-bias conductance peaks typical of a d-wave superconductor. A full correspondence is found between the tunneling spectra and the surface morphology down to a level of a unit-cell step. Splitting of the zero-bias conductance peak is seen in optimally doped and overdoped films, but not in the underdoped ones, suggesting that there is no transition to a state of broken time-reversal symmetry in the underdoped regime.

Original languageAmerican English
Pages (from-to)675-681
Number of pages7
JournalEurophysics Letters
Volume54
Issue number5
DOIs
StatePublished - 1 Jun 2001

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