Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.7: Poster

Montag, 31. März 2014, 15:00–19:00, P2

Superconductivity in epitaxial Ru-doped BaFe₂As₂ thin films — •Marco Langer^1,2, Jan Engelmann^1,2, Vadim Grinenko¹, Eike Ahrens², Fabian Nitsche³, Bernhard Holzapfel^1,4, Ludwig Schultz^1,2, and Ruben Hühne¹ — ¹Institute for Metallic Materials, IFW Dresden, PO Box 270116, D-01171 Dresden, Germany — ²Dresden University of Technology, D-01062 Dresden, Germany — ³Ludwig-Maximilians-University Munich, Department of Chemistry, D-81377 Munich, Germany — ⁴Karlsruhe Institute of Technology, Institute for Technical Physics, D-76344 Eggenstein-Leopoldshafen, Germany

The iron pnictide BaFe₂As₂ (Ba122) exhibits superconductivity either by carrier doping, chemical pressure, strain or external pressure. The key parameter for controlling the phase diagram of Ba122 is still under debate.

In order to investigate the driving factor of superconductivity in more detail we prepared thin Ba122 films with different ruthenium doping levels on single-crystal substrates using pulsed laser deposition. Structural investigations were carried out using θ-2θ x-ray diffraction and texture measurements revealing an epitaxial growth of the thin films. Electronic transport and SQUID-susceptibility measurements were performed to determine the electronic phase diagram. The results will be discussed in comparison to published phase diagrams for bulk materials.