Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 54: Fe-based Superconductors

TT 54.1: Vortrag

Donnerstag, 19. März 2020, 09:30–09:45, HSZ 201

Many-body interaction in iron-based superconductors — •Jörg Fink1,2,3, Emile Rienks4, Jörn Bannies2, Sabine Wurmehl1, Saicharan Aswartham1, Igor Morozov1, Luis Craco1, Helge Rosner2, Claudia Felser2, and Bernd Büchenr1,31IFW Dresden — 2MPI Chemical Physics of Solids, Dresden — 3TU Dresden — 4HZB Berlin

In this talk we will report on the determination of the energy and momentum dependence of scattering rates in iron-based superconductors using angle-resolved photoemission spectroscopy. We receive information on the location of hot spots on the Fermi surface determining antiferromagnetism and superconductivity as well as on cold spots determining the normal state transport and optical properties. For the hole doped compounds, we obtain scattering rates well above the Planckian limit, indicating a highly incoherent normal state electronic structure. In this way we obtain a microscopic understanding of the electronic structure of these systems in the normal and in the superconducting state. The experimental results on ferropnictides are compared with DFT+DMFT calculations describing Hunds metal behavior. There are remarkable differences between theory and experiment. The reason for this is possibly that DFT+DMFT uses only local correlation effects and does not include non-local spin fluctuation excitations.

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