Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 12: Poster Session Superconductivity
TT 12.49: Poster
Monday, March 11, 2013, 15:00–19:00, Poster D
Morphology of superconducting FeSe thin films grown by MBE and RF-sputtering — •Alexander Kronenberg1, Eike Venzmer1, Sebastian ten Haaf1, Janek Maletz1,2, and Martin Jourdan1 — 1Institut für Physik, Johannes Gutenberg Universität Mainz, Germany — 2Leibniz-Institut für Festkörper- und Werkstoffforschung, Dresden, Germany
Tunneling spectroscopy on planar junctions is the most direct approach for the investigation of superconducting coupling mechanisms [1]. However, it requires smooth interfaces at the tunneling barrier. The morphology of superconducting thin films of FeSe grown by MBE and co-sputtering (RF) from an iron and a selenium target are compared. MBE deposited films show an extreme sensitivity to stoichiometry, deposition temperature and choice of substrate [2]. These films exhibit macroscopic crevices and a pronounced roughness, rendering the preparation of tunneling junctions impossible. However, sputter deposited epitaxial FeSe thin films clearly show a more favorable morphology. Optical microscopy, AFM and SEM demonstrate a smooth surface with segregations which are eliminated by proper choice of the deposition parameters.
[1] M. Jourdan, M. Huth and H. Adrian, Nature 398, 47 (1999)
M. Jourdan and S. ten Haaf, J Appl. Phys. 108, 023913 (2010)