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Existence, character and origin of surface-related bands in the high temperature iron pnictide superconductor BaFe_{2-x}Co_{x}As_{2}
- Source :
- Phys. Rev. Lett. 106, 027002 (2011)
- Publication Year :
- 2010
-
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 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.<br />Comment: 4 pages, 5 figures includes supplementary material
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 106, 027002 (2011)
- Publication Type :
- Report
- Accession number :
- edsarx.1009.3493
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.106.027002