Quasiparticle states around a nonmagnetic impurity in electron-doped iron-based superconductors with spin-density-wave order

Abstract

The quasiparticle states around a nonmagnetic impurity in electron-doped iron-based superconductors with spin-density-wave (SDW) order are investigated as a function of doping and impurity scattering strength. In the undoped sample, where a pure SDW state exists, two impurity-induced resonance peaks are observed around the impurity site and they are shifted to higher (lower) energies as the strength of the positive (negative) scattering potential (SP) is increased. For the doped samples where the SDW order and the superconducting order coexist, the main feature is the existence of sharp in-gap resonance peaks whose positions and intensity depend on the strength of the SP and the doping concentration. In all cases, the local density of states exhibits clear $C_2$ symmetry. We also note that in the doped cases, the impurity will divide the system into two sublattices with distinct values of magnetic order. Here we use the band structure of a two-orbital model, which considers the asymmetry of the As atoms above and below the Fe-Fe plane. This model is suitable to study the properties of the surface layers in the iron-pnictides and should be more appropriate to describe the scanning tunneling microscopy experiments.

11 pages, 18 figures

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• Quantum phase transition of correlated iron-based superconductivity in LiFe${}_{1-x}$Co${}_x$As
• Impurity-induced quasiparticle interference in the parent compounds of iron-pnictide superconductors
• Deep data mining in a real space: Separation of intertwined electronic responses in a lightly-doped BaFe2As2
• Disorder effects in multiorbital $s_{\pm }$-wave superconductors: Implications for Zn-doped BaFe${}_2$As${}_2$ compounds
• Consistent picture for the electronic structure around a vortex core in iron-based superconductors
• Phase diagram of doped BaFe${}_2$As${}_2$ superconductor under broken $C_4$ symmetry
• Evolution of the Fermi surface topology in doped 122 iron pnictides
• Observation of isosceles triangular electronic structure around excess iron atoms in Fe${}_{1+\delta }$Te
• Superfluid density in the $s_{\pm }$-wave state of clean iron-based superconductors
• Impurity-induced resonant states in topological nodal-line semimetals
• Evolution of quasiparticle states with and without a Zn-impurity in doped 122 iron pnictides
• Single nonmagnetic impurity resonance in FeSe-based 122-type superconductors as a probe for pairing symmetry
• Magnetic domain walls induced by twin boundaries in low doped Fe-pnictides
• Effect of transition-metal substitution in iron-based superconductors
• Effects of single- and multi-substituted Zn ions in doped-122 type iron-based superconductors
• Probing Sign-Changing Order Parameters via Impurity States in unconventional superconductors: Implications for La${}_3$Ni${}_2$O${}_7$ Superconductors with interlayer pairing
• Robust $s_{\pm }$-wave superconductivity against multi-impurity in iron-based superconductors
• Layer-Resolved Impurity States Reveal Competing Pairing Mechanisms in Trilayer Nickelate Superconductor La${}_4$Ni${}_3$O${}_{10}$