Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Existence, character and origin of surface-related bands in the high
  temperature iron pnictide superconductor BaFe_{2-x}Co_{x}As_{2}   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.

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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph