Volume 62, Number 6, June 2003
|Page(s)||883 - 889|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 June 2003|
Scanning tunneling spectroscopy of -axis films: k-selectivity and the shape of the superconductor gap
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: email@example.com
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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