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MA: Fachverband Magnetismus

MA 42: Magnetic Materials III

MA 42.3: Vortrag

Donnerstag, 3. April 2014, 15:30–15:45, HSZ 04

Angle-resolved photoemission spectroscopy on iron-chalcogenide superconductors — •Janek Maletz¹, Volodymyr Zabolotnyy¹, Daniil Evtushinsky¹, Setti Thirupathaiah¹, Anja Wolter-Giraud¹, Luminita Harnagea¹, Alexander Yaresko³, Alexander Vasiliev⁴, Dimitri Chareev⁵, Emile Rienks⁶, Bernd Büchner^1,2, Alexander Kordyuk¹, Zurab Shermadini⁷, Hubertus Luetkens⁷, Kamil Sedlak⁷, Rustem Khasanov⁷, Alex Amato⁷, Anna Krzton-Maziopa⁷, Kazimierz Conder⁷, Ekaterina Pomjakushina⁷, Hans-Henning Klauß², and Sergey Borisenko¹ — ¹IFW Dresden — ²TU Dresden — ³MPI-FKF, Stuttgart — ⁴Moscow State University — ⁵RAS, Chernogolovka, Russia — ⁶Helmholtz-Zentrum Berlin — ⁷Paul Scherrer Institute, Switzerland

The electronic structure of the iron chalcogenide superconductors FeSe_1−x and Rb_0.77Fe_1.61Se₂ was investigated by high-resolution angle-resolved photoemission spectroscopy (ARPES). The results were compared to DFT calculations and µSR measurements. Both compounds share "cigar-shaped" Fermi surface sheets in their electronic structure, that can be found in almost all iron-pnictide superconductors. These features originate from a strong interplay of two hole- and electron-like bands in the Brillouin zone center, leading to a pronounced singularity in the density of states just below the Fermi level. This faciliates the coupling to a bosonic mode responsible for superconductivity. This work was supported by the DFG Schwerpunkt- programm 1458 (BO1912/3-1 and BO1912/2-2).