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TT: Fachverband Tiefe Temperaturen

TT 27: SC: Fe-based Superconductors - LiFeAs

TT 27.5: Talk

Tuesday, March 15, 2011, 15:00–15:15, HSZ 304

Quasiparticle interference of superconducting LiFeAs — •Torben Hänke, Steffen Sykora, Ronny Schlegel, Danny Baumann, Sabine Wurmehl, Igor Morozov, Luminita Harnagea, Christian Hess, Jeroen van den Brink, and Bernd Büchner — IFW Dresden, Institute for Solid State Research, P.O. Box 270116, D-01171 Dresden, Germany

We performed scanning tunneling spectroscopy measurements on the iron pnictide superconductor LiFeAs in the superconducting state. After cleavage of the crystal, we observe atomically flat surfaces which contain several defects in the field of view (FOV) of about 20×20 nm². Already in topographic images, pronounced spatial modulations of the integral density of states are present, which are particular strong in the vicinity of the defects. We recorded full dI/dV(V) spectroscopy maps to determining the energy dependent quasiparticle interference in the FOV. The Fourier transform of the dI/dV maps exhibits a rich structure which has a strong resemblance of constant energy cuts through the experimental band structure. We will compare the experimental data with theoretically calculated quasiparticle interference using a realistic three-band model which is consistent with recent ARPES experiments.