Physics – Condensed Matter – Superconductivity
Scientific paper
2010-09-17
Phys. Rev. Lett. 106, 027002 (2011)
Physics
Condensed Matter
Superconductivity
4 pages, 5 figures includes supplementary material
Scientific paper
10.1103/PhysRevLett.106.027002
Low energy electron diffraction (LEED) experiments, LEED simulations and finite slab density functional calculations are combined to study the cleavage surface of Co doped BaFe_{2-x}Co_{x}As_{2} (x = 0.1, 0.17). We demonstrate that the energy dependence of the LEED data can only be understood from a terminating 1/2 Ba layer accompanied by distortions of the underlying As-Fe_2-As block. As a result, surface related Fe 3d states are present in the electronic structure, which we identify in angle resolved photoemission experiments. The close proximity of the surface-related states to the bulk bands inevitably leads to broadening of the ARPES signals, which excludes the use of the BaFe_{2-x}Co_{x}As_{2} system for accurate determination of self-energies using ARPES.
Goedkoop Jeroen
Golden Mark S.
Heumen Erik van
Huang Yingkai
Klei Jesse
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