Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 13: Superconductivity: Fe-based Superconductors - 122
TT 13.1: Vortrag
Montag, 20. März 2017, 15:00–15:15, HSZ 103
Fermi surface and effective masses in photoemission response of the K doped BaFe2As2 superconductor — Gerald Derondeau1, Federico Bisti2, Jürgen Braun1, Hubert Ebert1, Vladimir Strocov2, and •Jan Minar1,3 — 1LMU München, Germany — 2Swiss Light Source, PSI, Villigen, Switzerland — 3University of West Bohemia, Pilsen, Czech Republic
The angle-resolved photoemission spectra of the K doped superconductor BaFe2As2 have been investigated both experimentally and theoretically. Our results explain the previously obscured origins of all salient features of the ARPES response of this paradigm pnictide compound and reveal the origin of the Lifshitz transition. Comparison of calculated ARPES spectra with the underlying DMFT band structure shows an important impact of final state effects, which results for three-dimensional states in a deviation of the ARPES spectra from the underlying spectral function. In particular, the apparent effective mass enhancement seen in the ARPES response is not an entirely intrinsic property of the quasiparticle valence bands but has a significant extrinsic contribution from the photoemission process and thus differ from its true value. Because this effect is more pronounced for low photoexcitation energies, soft-X-ray ARPES delivers more accurate values of the mass enhancement due to a sharp definition of the 3D electron momentum.