Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Superconductivity: Fe-based Superconductors - Fe(Se,Te), LiFeAs, and other Materials
TT 36.3: Vortrag
Mittwoch, 13. März 2013, 10:00–10:15, H18
Preparation and characterization of thin films of the superconductor FeSe — Eike Venzmer1, •Alexander Kronenberg1, Sebastian ten Haaf1, Janek Maletz2, and Martin Jourdan1 — 1Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, 55128 Mainz, Germany — 2IFW-Dresden, Institute for Solid State Research, PO Box 270116, D-01171 Dresden, Germany
The recently discovered class of iron pnictide compounds features a presumably unconventional mechanism of superconductivity. We investigate the iron chalcogenide FeSe, which is the structurally simplest representative of this class of materials. Epitaxial thin films are prepared by rf-sputtering from a stoichiometric FeSe target and alternatively by co-sputtering from separate Fe and Se targets. Both methods yield superconducting epitaxial thin films on MgO(100) as well as on YAlO3(010) substrates. The influence of deposition rates and substrate temperature on phase formation, sample homogeneity, morphology and electronic transport properties are discussed. A comparison with the properties of previously prepared by MBE [1] will be presented. The main advantage of the sputter deposited samples is an improved morphology which is promising for the future integration in planar tunneling junctions for spectroscopic investigations.
[1] M. Jourdan, S. ten Haaf, J. Appl. Phys. 108, 023913 (2010)