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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.29: Poster

Montag, 31. März 2014, 15:00–19:00, P2

Temperature dependent density of states study in stoichiometric LiFeAs — •Pranab Kumar Nag¹, Danny Baumann¹, Ronny Schlegel¹, Robert Beck¹, Sabine Wurmehl^1,2, Bernd Büchner^1,2,3, and Christian Hess^1,3 — ¹Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01171 Dresden, Germany — ²Institut für Festkörperphysik, TU Dresden, D-01062 Dresden, Germany — ³Center for Transport and Devices of Emergent Materials, TU Dresden, 01069 Dresden

We present scanning tunneling microscopy / spectroscopy data for the stoichiometric iron arsenide superconductor LiFeAs. Temperature dependent tunneling spectra, obtained at a defined position on the surface, reveal a systematic closing of the superconducting gap with temperature, consistent with a bulk critical temperature of 16 K. We have observed a dip-hump structure in the quasiparticle density of states which is the indication of a strong electron-boson coupling in this material.