Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Superconductivity: Fe-based Superconductors - 1111 & 111
TT 25.5: Vortrag
Dienstag, 8. März 2016, 10:30–10:45, H19
Superconductivity in LiFeAs probed with quasiparticle interference — •Zhixiang Sun1, Pranab Kumar Nag1, Danny Baumann1, Rhea Kappenberger1, Sabine Wurmehl1,2, Bernd Büchner1,2,3, and Christian Hess1,3 — 1Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01069 Dresden, Germany — 2Institute for Solid State Physics, TU Dresden, 01069 Dresden — 3Center for Transport and Devices, TU Dresden, 01069 Dresden, Germany
In spite of many theoretical and experimental efforts on studying the superconductivity of iron-based high temperature superconductors, the puzzle about LiFeAs's superconducting mechanism and pairing symmetry are still not clear. Here we want to present our low temperature scanning tunneling microscopy results on probing the superconductivity of LiFeAs. By taking conductance spectroscopic maps for both the superconducting state and normal state, we identify the scatterings due to the electron and hole bands close to the Fermi level. We observe a strong indication that the superconducting behavior in the hole bands are important for the formation of superconductivity in LiFeAs. Our results may also shine light on understanding the superconductivity in other iron pnictide superconductors.