We study impurity-induced magnetic order within a five-band Hubbard model relevant to the normal paramagnetic phase of iron-based superconductors. The existence of the local magnetic order is explained in terms of an impurity enhancement of states near the Fermi level and we map out the resulting phase diagram of the existence of magnetization as a function of impurity strength and Coulomb correlations. In particular, the presence of impurity-induced magnetism in only a certain range of potential scattering strengths can be understood from the specific behavior of the impurity resonant state.
Bibliographical noteFunding Information:
We acknowledge support from the Lundbeckfond fellowship (grant A9318).
- Impurity states
- Induced order
- Iron pnictides