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TT: Fachverband Tiefe Temperaturen

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

TT 2.8: Vortrag

Montag, 26. März 2012, 11:30–11:45, H 2053

Defect dependent influence on the superconducting gap of LiFeAs — •Danny Baumann, Torben Hänke, Ronny Schlegel, Sabine Wurmehl, Rico Pohle, Martha Scheffler, Luminita Harnagea, Christian Hess, and Bernd Büchner — IFW Dresden, Institute for Solid State Research, P.O. Box 270116, D-01171 Dresden, Germany

We have performed scanning tunneling spectroscopy measurements on the stoichiometric iron pnictide superconductor LiFeAs. After cleaving single crystalline samples, we observe a flat sample surface which can be imaged with atomic resolution by scanning tunneling microscopy. In addition, the surface contains a small amount of defects.

Here we will report on the dependence of the spectroscopic signature of LiFeAs on the occurring defects. Furthermore, we will present an analysis of the structure and symmetry of the observed defects and the influence on the density of the state of LiFeAs.