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TT: Fachverband Tiefe Temperaturen
TT 2: Superconductivity: Fe-based Superconductors - 1111, LiFeAs & As-free Pnictides
TT 2.9: Talk
Monday, March 26, 2012, 11:45–12:00, H 2053
Temperature dependency of the superconducting gap in LiFeAs probed by STM — •Martha Scheffler, Rico Pohle, Torben Hänke, Ronny Schlegel, Danny Baumann, Steffen Sykora, Luminita Harnagea, Sabine Wurmehl, Christian Hess, Jeroen van den Brink, and Bernd Büchner — IFW Dresden, Institute for Solid State Research, P.O. Box 270116, D-01171 Dresden, Germany
We present temperature depending scanning tunneling spectroscopy measurements on the iron pnictide superconductor LiFeAs. At temperatures T ∼ 15K we see that the superconducting gap vanishes. Independent on the temperature we observe an asymmetry in the spectra with additional features near the Fermi energy and 50mV above EF.
The good agreement of our results with model calculations for the tunneling conductance allows us to draw conclusions about the low energy properties of the superconducting system.