Issue |
Europhys. Lett.
Volume 62, Number 6, June 2003
|
|
---|---|---|
Page(s) | 883 - 889 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00455-9 | |
Published online | 01 June 2003 |
Scanning tunneling spectroscopy of
-axis
films: k-selectivity and
the shape of the superconductor gap
1
Racah Institute of Physics, The Hebrew University - Jerusalem 91904, Israel
2
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Science, Tel Aviv University - 69978 Tel Aviv, Israel
3
Department of Physics, Technion, Israel Institute of Technology - Haifa 32000, Israel
Corresponding author: milode@vms.huji.ac.il
Received:
21
November
2002
Accepted:
18
April
2003
Tunneling spectroscopy of epitaxial (100) oriented
films was performed using an STM at
4.2
. 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
introducing a strong dependence of the tunneling probability on
the wave vector
. Possible origins for this
-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
-selectivity
and the effect of nanofaceting, respectively.
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, 2003
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