Existence, character and origin of surface-related bands in the high temperature iron pnictide superconductor BaFe {2-x}Co {x}As {2} - Condensed Matter > SuperconductivityReport as inadecuate




Existence, character and origin of surface-related bands in the high temperature iron pnictide superconductor BaFe {2-x}Co {x}As {2} - Condensed Matter > Superconductivity - Download this document for free, or read online. Document in PDF available to download.

Abstract: Low energy electron diffraction LEED experiments, LEED simulations andfinite slab density functional calculations are combined to study the cleavagesurface of Co doped BaFe {2-x}Co {x}As {2} x = 0.1, 0.17. We demonstrate thatthe energy dependence of the LEED data can only be understood from aterminating 1-2 Ba layer accompanied by distortions of the underlyingAs-Fe 2-As block. As a result, surface related Fe 3d states are present in theelectronic structure, which we identify in angle resolved photoemissionexperiments. The close proximity of the surface-related states to the bulkbands inevitably leads to broadening of the ARPES signals, which excludes theuse of the BaFe {2-x}Co {x}As {2} system for accurate determination ofself-energies using ARPES.



Author: Erik van Heumen, Johannes Vuorinen, Klaus Koepernik, Freek Massee, Yingkai Huang, Ming Shi, Jesse Klei, Jeroen Goedkoop, Matti Li

Source: https://arxiv.org/







Related documents