Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 36: Superconductivity: Fe-based Superconductors - Fe(Se,Te), LiFeAs, and other Materials

TT 36.12: Vortrag

Mittwoch, 13. März 2013, 12:30–12:45, H18

Superconducting thin films of As-free pnictide LaPd_1−xSb₂ 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 as synthesis technique for the search of arsenic free pnictide superconductors. Epitaxial thin films of LaPd_1−xSb₂ were grown on (100) MgO substrates from elemental sources by simultaneous evaporation of high purity La, Pd and Sb metals by e-gun. LaPd_1−xSb₂ belongs to a novel class of pnictide superconductors with a peculiar pnictide square net layer [1]. Previously, we have reported epitaxial growth of isostructural Bi based compounds [2]. The substitution of Bi by Sb leads to thin films with metallic behavior and room temperature resistivity of about 85 µ Ωcm. The highest observed transition temperature T_c inLaPd_1−xSb₂ is 3.1 K and does not depend on x. We discuss strategies to increase T_c in this pnictide subfamily.
[1] H. Mizoguchi et al., Phys. Rev. Lett. 106, 057002 (2011)
[2] A. Buckow et al., Appl. Phys. Lett. 101, 162602 (2012).