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TT: Fachverband Tiefe Temperaturen
TT 52: Superconductivity: Fe-based Superconductors - FeSe and LiFeAs
TT 52.13: Talk
Wednesday, March 14, 2018, 12:45–13:00, HFT-FT 101
Electron-boson interaction of LiFeAs revealed by resonantly enhanced Friedel oscillations: Theory — •Steffen Sykora1, Zhixiang Sun1, Pranab Kumar Nag1, 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
We present a new experimental/theoretical approach to determine bosonic modes by investigating resonantly enhanced Friedel oscillations caused by a coupling of conduction electrons to the bosons. Upon focusing on the unconventional superconductor LiFeAs we show that under particular conditions the impurity scattering potential is strongly renormalized leading to enhanced signals in the quasiparticle interference. For this a simplified model of electron-boson coupling in the presence of one single impurity is solved by a many-particle renormalization method. Comparing our theoretical results with Fourier transform scanning tunneling spectroscopy data we reveal for LiFeAs bosonic states at particular momentum and energy. The bosonic modes are promising candidates for providing the pairing interaction in LiFeAs.