Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 90: Electronic structure of surfaces: Spectroscopy, surface states IV
O 90.8: Vortrag
Donnerstag, 15. März 2018, 12:15–12:30, MA 042
Observation of a remarkable reduction of correlation effects in BaCr2As2 by ARPES — •Jayita Nayak1, Kai Filsinger1, Gerhard H. Fecher1, Stanislav Chadov1, Jan Minár2, Emile D. L. Rienks3,4, Bernd Buchner3,4, Jorg Fink1,3, and Claudia Felser1 — 1Max Planck Institute CPFS, Dresden, Germany — 2University of West Bohemia,Pilsen, Czech Republic — 3Institute for Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden, D- 01171 Dresden, Germany — 4Institute for Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden, D- 01171 Dresden, Germany
The superconducting phase in iron-based high-Tc superconductors (FeSC) neighbors a magnetically ordered one in the phase diagram. This proximity hints at the importance of electron correlation effects in these materials. Hunds exchange interaction has been suggested to be the dominant correlation effect in FeSCs because of their multiband nature. Correlation should be strongest for materials closest to a half filled 3d electron shell (Mn compounds, hole-doped FeSCs) and decrease for systems with both higher (electron-doped FeSCs) and lower (Cr-pnictides) 3d counts. Here we find that the strength of correlation effects in nonsuperconducting antiferromagnetic BaCr2As2 is strongly reduced. We have used angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations for this investigation.