Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Fe-based Superconductors - 1111, LiFeAs & As-free Pnictides

TT 2.12: Talk

Monday, March 26, 2012, 12:30–12:45, H 2053

As-free pnictide LaNi_1−xSb₂ thin films grown by Reactive Molecular Beam Epitaxy — •Reiner Retzlaff, Alexander Buckow, Jose Kurian, and Lambert Alff — Institute of Materials Science, Technische Universität Darmstadt, Petersenstr. 23, 64287 Darmstadt, Germany

We use reactive molecular beam epitaxy (RMBE) as synthesis technique for the search of arsenic free pnictide superconductors. Epitaxial thin films of LaNi_1−xSb₂ were grown on (100) MgO substrates from elemental sources by simultaneous evaporation of high purity La, Ni and Sb metals by e-gun. The LaNi_1−xSb₂ thin films grow epitaxially and are (00l) oriented with high crystalline quality, as evident from RHEED and X-Ray diffraction studies. The Ni deficient LaNi_1−xSb₂ thin films show metallic behavior with a room temperature resistivity of 110 µ Ωcm, while the stoichiometric compound is a semiconductor/insulator [1]. The isostructural compound with Bi as pnictide shows a superconducting transition with a T_C(0) of 3.1 K.
R. Retzlaff et al. Submitted.