Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.29: Poster
Monday, March 31, 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 Wurmehl1,2, Bernd Büchner1,2,3, and Christian Hess1,3 — 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.