Local magnetization nucleated by non-magnetic impurities in Fe-based superconductors
arXiv:1409.6068 · doi:10.1007/s10948-014-2908-2
Abstract
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.
8 pages, 3 figures
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