We study the presence of impurity bound states within a five-band Hubbard model relevant to iron-based superconductors. In agreement with earlier studies, we find that in the absence of Coulomb correlations there exists a range of repulsive impurity potentials where in-gap states are generated. In the presence of weak correlations, these states are generally pushed to the edges of the gap, whereas for larger correlations the on-site impurity potential induces a local magnetic region, which reintroduces the low-energy bound states into the gap.
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Acknowledgements B.M.A. acknowledges support from The Danish Council for Independent Research | Natural Sciences.
- Impurity states
- Induced order
- Iron pnictides