2010/09/17 by Erik van Heumen, Johannes Vuorinen, Klaus Koepernik +13 · 4 citations
Business, Management and Accounting · Chemistry · Materials Science · Physics and Astronomy · #Angle-resolved photoemission spectroscopy #Chemistry #Condensed matter physics #Corporate Taxation and Avoidance #Crystallography #Electronic structure #Energy (signal processing) #Geometry #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Nuclear magnetic resonance #Photoemission spectroscopy #Physics #Pnictogen #Quantum mechanics #Superconductivity #Surface (topology) #X-ray photoelectron spectroscopy #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.106.027002
published as Phys. Rev. Lett. 106, 027002 (2011) · 4 pages, 5 figures includes supplementary material
arxiv created 2010/09/17 · openalex publication_date 2011/01/13 · arxiv updated 2011/01/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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\ensuremath-xCoxAs2 (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\mathrm\text\ensuremath-Fe2\mathrm\text\ensuremath-As block. As a result, surface-related Fe 3d states are present in the electronic structure, which we identify in angle resolved photoemission spectroscopy (ARPES) 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\ensuremath-xCoxAs2 system for accurate determination of self-energies using ARPES.