Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 46: Superconductivity: Fe-based Superconductors - FeSe
TT 46.4: Vortrag
Mittwoch, 9. März 2016, 10:45–11:00, H19
Influence of substrate type on transport properties of superconducting FeSe0.5Te0.5 thin films — •Feifei Yuan1,2, Kazumasa Iida1,3, Marco Langer1,4, Jens Hänisch1,4, Ruben Hühne1, and Ludwig Schultz1 — 1IFW, Dresden, Germany — 2Southeast University, Nanjing, China — 3Nagoya University, Nagoya, Japan — 4KIT, Eggenstein-Leopoldshafen, Germany
FeSe0.5Te0.5 thin films were grown by pulsed laser deposition on CaF2, AlO3 and MgO substrates and structurally and electro-magnetically characterized in order to study the influence of the substrate on their transport properties. The in-plane lattice mismatch between FeSe0.5Te0.5 bulk and the substrate shows no influence on the lattice parameters of the films, whereas the type of substrate affects the crystalline quality of the films and, therefore, the superconducting properties. The film on MgO showed an extra peak in the angular dependence of critical current density Jc at θ = 180∘ (H//c), which arises from c-axis defects as confirmed by transmission electron microscopy. In contrast, no Jc peaks for H//c were observed in films on CaF2 and LaAlO3. Jc(θ) can be scaled successfully for both films without c-axis correlated defects by the anisotropy Ginzburg-Landau approach with appropriate anisotropy ratio γ. The scaling parameter γ is decreasing with decreasing temperature, which is different from what we observed in FeSe0.5Te0.5 films on Fe-buffered MgO substrates.