Existence, Character, and Origin of Surface-Related Bands in the High Temperature Iron Pnictide Superconductor BaFe2−xCoxAs2
Erik van Heumen, Johannes Vuorinen, Klaus Koepernik, Freek Massee, Yingkai Huang, Ming Shi, Jesse Klei, Jeroen Goedkoop, Matti Lindroos, Jeroen van den Brink, Mark S. Golden
DOI 10.1103/PhysRevLett.106.027002 · Physical Review Letters
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Abstract
Low energy electron diffraction (LEED) experiments, LEED simulations, and finite slab density functional calculations are combined to study the cleavage surface of Co doped BaFe2−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−Fe2−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 BaFe2−xCoxAs2 system for accurate determination of self-energies using ARPES.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2-xCoxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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