| Issue |
Europhys. Lett.
Volume 54, Number 5, June 2001
|
|
|---|---|---|
| Page(s) | 675 - 681 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00368-1 | |
| Published online | 01 December 2003 | |
Correlation of tunneling spectra with surface nanomorphology and doping in thin
films
1
Racah Institute of Physics, The Hebrew University - Jerusalem 91904, Israel
2
Department of Physics, Technion-Israel Institute
of Technology, Haifa 32000, Israel
Corresponding author: milode@vms.huji.ac.il
Received:
25
January
2001
Accepted:
29
March
2001
Tunneling spectra measured on thin epitaxial
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.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.72.Bk – Y-based cuprates / 74.80.-g – Spatially inhomogeneous structures
© EDP Sciences, 2001
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