Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: FS: Iron-Based Superconductors

TT 25.6: Talk

Wednesday, March 24, 2010, 17:00–17:15, H20

ARPES studies on FeAs-based superconductors and their parent compounds — •Jörg Fink^1,2, S. Thirupathaiah¹, R. Ovsyannikov¹, H.A. Dürr¹, S. de Jong³, Y. Huang³, R. Huisman³, M.S. Golden³, A. Gloskovskii⁴, Y.Z. Zhang⁵, H.O. Jeschke⁵, R. Valenti⁵, H.S. Jeevan⁶, P. Gegenwart⁶, and A. Erb⁷ — ¹HZ Berlin — ²IFW Dresden — ³U Amsterdam — ⁴U Mainz — ⁵U Frankfurt — ⁶U Göttingen — ⁷WMI Garching

We report high-resolution ARPES studies of the electronic structure of BaFe_2−xCo_xAs₂, Ba_1−xK_xFe₂As₂, FeTe(Se), and EuFe₂As₂. The results are compared with DFT band structure calculations. From photon energy dependent measurements, information on the band dispersion perpendicular to the Fe layers could be derived. with increasing Co doping in BaFe_2−xCo_xAs₂, the dimensionality increases and, due to the filling of the hole pockets, the nesting condition decreases. In the AFM phase of EuFe₂As₂ back-folded bands strongly hybridize with the non-folded bands leading to the opening of gaps around both high-symmetry points. This transforms the large Fermi surface of the PM phase into droplet Fermi surfaces in the AFM low-T phase.