Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 53: Superconductivity: Fe-based Superconductors - 122
TT 53.6: Vortrag
Mittwoch, 2. April 2014, 10:45–11:00, HSZ 201
ARPES of iron-based superconductors: from low- to high-energy edge of 3d band — •Daniil Evtushinsky, Volodymyr Zabolotnyy, Janek Maletz, Bernd Büchner, and Sergei Borisenko — Institute for Solid State Research, IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany
An overview of the available angle-resolved photoemission spectroscopy (ARPES) measurements of iron-based superconductors will be given. Large variety of Fermi surface shapes and topologies as well as superconducting gap momentum distributions was observed. At the same time one can point out several common tendencies for iron high temperature superconductors - band renormalization, often a two-gap behavior, presence of an electronic coupling to the low-energy bosonic modes. A correlation between the superconducting gap magnitude and orbital origin of the electronic states was found; further analysis of the electronic structures of different iron arsenides consistently points to the significance of 3dxy,yz bands for superconductivity in these materials. The recently revealed high-energy anomalies in the electronic spectra of iron superconductors are very reminiscent of the corresponding structures for cuprates. This implies that physical processes with energy scales of the whole 3d band might be important for the emergence of superconductivity with highest transition temperatures.