Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 2: Superconductivity: Fe-based Superconductors - 1111, LiFeAs & As-free Pnictides
TT 2.13: Talk
Monday, March 26, 2012, 12:45–13:00, H 2053
Synthesis of As-free pnictide superconductors RENi1−xBi2 (RE= La, Ce) using Molecular Beam Epitaxy — •Alexander Buckow, Reiner Retzlaff, Jose Kurian, and Lambert Alff — FB Materialwissenschaft, TU Darmstadt, Deutschland
We have used reactive molecular beam epitaxy (RMBE) as synthesis technique for the search for arsenic free pnictide superconductors. High quality epitaxial thin films of LaNiBi2, which was reported recently [1], were successfully grown on (100) MgO substrates by RMBE. The films were (00l) oriented and the epitaxial nature of the films was confirmed by RHEED and X-ray diffraction measurements. The a-axis of LaNiBi2 is 45∘ rotated with respect to the MgO lattice. The c-axis lattice constant was determined to be 9.79 Å and the in-plane lattice constant is 4.565 Å. Ni deficient films show a TC(0) of 3.1 K, while the stoichiometric compound is semiconducting [2]. Furthermore, we report on the substitution of La by Ce demonstrating the capability of MBE as material screening tool.
H. Mizoguchi et al., Phys. Rev. Lett. 106, 057002 (2011)
A. Buckow et al. (to be published)