Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 52: Superconductivity: Fe-based Superconductors - FeSe and LiFeAs
TT 52.11: Talk
Wednesday, March 14, 2018, 12:15–12:30, HFT-FT 101
Electron-boson interaction of LiFeAs revealed by resonantly enhanced Friedel oscillations: Experiment — Zhixiang Sun1, Pranab Kumar Nag1, Steffen Sykora1, Jose M. Guevara1, Rhea Kappenberger1, Sabine Wurmehl1,2, Bernd Büchner1,2,3, and •Christian Hess1,3 — 1IFW Dresden, 01069 Dresden, Germany — 2Institute for Solid State Physics, TU Dresden, 01069 Dresden, Germany — 3Center for Transport and Devices, TU Dresden, 01069 Dresden, Germany
For rationalizing the Cooper pairing mechanism in a superconductor, it is central to identify bosons interacting with the conduction electrons. We determine the energy and momentum characteristics of such bosons in LiFeAs by exploiting the boson-assisted resonant amplification of Friedel oscillations by Fourier transform scanning tunneling spectroscopy (FT-STS). We show that the FT-STS signatures of the bosonic states survive in the normal state, and, moreover, that they are in perfect agreement with well-known strong above-gap anomalies in independently measured tunneling spectra at the very same energy. Thus, the small-momentum bosonic modes are promising candidates for providing the pairing interaction in LiFeAs.