Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 36: SC: Fe-based Superconductors - 122 - Properties, Electronic Structure, Mechanisms

TT 36.9: Talk

Wednesday, March 16, 2011, 16:15–16:30, HSZ 304

Bridging angle-resolved photoemission spectroscopy (ARPES) with other experiments in case of iron arsenides — •Daniil Evtushinsky, Volodymyr Zabolotnyy, Alexander Kordyuk, Timur Kim, Bernd Büchner, and Sergey Borisenko — IFW Dresden

The single crystals of (Ba,K)Fe₂As₂ and LiFeAs were measured with angle-resolved photoemission spectroscopy (ARPES). After clarification of the Fermi surface topology, we address the issue of the superconducting gap in these compounds, which was determined via fitting the distribution of the quasiparticle density to a model, incorporating finite lifetime and experimental resolution effects. Low energy electronic structure defines many macroscopic properties of a solid, which allowed us to perform the calculation of the London penetration depth and Hall coefficient purely on the basis of ARPES data.The agreement with different measurements of the superfluid density and with magnetotransport experiments was observed. Overview of the available experimental results suggests two-gap superconductivity for most of the studied iron arsenides.