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TT: Fachverband Tiefe Temperaturen

TT 48: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Vortices

TT 48.1: Talk

Friday, March 30, 2012, 09:30–09:45, H 2053

Epitaxial Fe/BaFe_2−xCo_xAs₂ multilayers — •Jan Engelmann^1,2, Silvia Haindl¹, Kazumasa IIda¹, Fritz Kurth¹, Christian Behler¹, Ruben Huehne¹, Bernhard Holzapfel¹, and Ludwig Schultz^1,2 — ¹IFW Dresden, P. O. Box 27 01 16, 01171 Dresden, Germany — ²TU Dresden, Institut für Festkörperphysik, D-01069 Dresden, Germany

Heterostructures of superconducting/ferromagnetic layers have attracted attention in controlling superconductivity by changing the magnetic state. In this work we present multilayers consisting of iron and Co-doped BaFe₂As₂ (Ba-122) fabricated by UHV pulsed laser deposition. We have employed the advantage of a coherent interfacial bonding between the FeAs tetrahedron of the iron pnictides and bcc Fe which enables the growth of epitaxial bi- and multilayers of Fe and the new Fe-based superconductors of high crystalline quality [1, 2] The epitaxial growth of the heterostructures was controlled in-situ by reflection high-energy electron diffraction (RHEED) and ex-situ by X-ray analysis. We discuss selected results of transport measurements with respect to the influence of additional Fe layers.
T. Thersleff et al., APL 97 (2010) 022506
K. Iida et al., APL 97 (2010) 172507