Impurity bound states and disorder-induced orbital and magnetic order in the s+- state of Fe-based superconductors

Abstract

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 onsite impurity potential induces a local magnetic region which reintroduces the low-energy bound states into the gap.

References in corpus (6)

• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Anisotropic Energy Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs
• Scanning Tunneling Microscopy/Spectroscopy of Vortices in LiFeAs
• Disorder-induced freezing of dynamical spin fluctuations in underdoped cuprates
• Magnetic impurities in the two-band $s_{\pm }$-wave superconductors
• Local modulations of the spin-fluctuation mediated pairing interaction by impurities in d-wave superconductors

Cited by in corpus (7)

• Origin of electronic dimers in the spin-density wave phase of Fe-based superconductors
• Pair breaking due to orbital magnetism in iron-based superconductors
• Electronic vortex structure of Fe-based superconductors: application to LiFeAs
• Competing superconducting and magnetic order parameters and field-induced magnetism in electron doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Quasiparticle scattering interference in iron pnictides: A probe of the origin of nematicity
• Local magnetization nucleated by non-magnetic impurities in Fe-based superconductors
• Impurity-induced sub-gap bound gap states in alkali doped iron chalcogenide superconductors