Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 20: SC: Fabrication and Characterization of Iron-Based and Other Superconductors

TT 20.1: Talk

Wednesday, March 24, 2010, 09:30–09:45, H19

Preparation and transport properties of FeSe thin films — •Martin Jourdan, Sebastian ten Haaf, and Janek Maletz — Institut für Physik, Johannes Gutenberg Universität Mainz, 55099 Mainz, Germany

Thin films of the presumably unconventional superconductor FeSe were prepared by molecular beam epitaxy (MBE). X-ray diffraction reveals epitaxial growth. The temperature dependent resistance of the samples depends crucially on the stoichiometry with variations in the order of 1% determining the observation or absence of superconductivity. The best samples show a critical temperature of 7K with a resistive transition width of 1K. Angular dependent measurements of the upper critical field reveal a pronounced anisotropy which is increasing with sample purity. Measurements of the Hall-effect in the normal conducting regime are related with sample stoichiometry as determined by energy dispersive x-ray spectroscopy (EDX) on thick films (thickness 600nm).