Physics – Condensed Matter – Superconductivity
Scientific paper
2009-11-19
Phys. Rev. B 81, 014524 (2010)
Physics
Condensed Matter
Superconductivity
7 pages, 5 figures, theory part is extended, figures are replaced
Scientific paper
10.1103/PhysRevB.81.014524
We investigate the effect of magnetic impurities on the local quasiparticle density of states (LDOS) in iron-based superconductors. Employing the two-orbital model where 3$d$ electron and hole conduction bands are hybridizing with the localized $f$-orbital of the impurity spin, we investigate how various symmetries of the superconducting gap and its nodal structure influence the quasiparticle excitations and impurity bound states. We show that the bound states behave qualitatively different for each symmetry. Most importantly we find that the impurity-induced bound states can be used to identify the nodal structure of the extended s-wave symmetry ($S^{\pm}$) that is actively discussed in ferropnictides.
Akbari Alireza
Eremin Ilya
Thalmeier Peter
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