Impurity states and cooperative magnetic order in Fe-based superconductors

Abstract

We study impurity bound states and impurity-induced order in the superconducting state of LiFeAs within a realistic five-band model based on the band structure and impurity potentials obtained from density functional theory (DFT). In agreement with recent experiments, we find that Co impurities are too weak produce sub-gap bound states, whereas stronger impurities like Cu do. We also obtain the bound state spectrum for magnetic impurities, such as Mn, and show how spin-resolved tunnelling may determine the nature of the various defect sites in iron pnictides, a prerequisite for using impurity bound states as a probe of the ground state pairing symmetry. Lastly we show how impurities pin both orbital and magnetic order, providing an explanation for a growing set of experimental evidence for unusual magnetic phases in doped iron pnictides.

5 pages, 5 figs

References in corpus (15)

• 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
• Superfluid density of the $\pm$s-wave state for the iron-based superconductors
• Scanning Tunneling Microscopy/Spectroscopy of Vortices in LiFeAs
• Disorder-Induced Static Antiferromagnetism in Cuprate Superconductors
• Superconducting gap in LiFeAs from three-dimensional spin-fluctuation pairing calculations
• Effect of Nonmagnetic Impurity in Nearly Antiferromagnetic Fermi Liquid: Magnetic Correlations and Transport Phenomena
• Disorder-induced freezing of dynamical spin fluctuations in underdoped cuprates
• Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2
• Muon spin rotation study of magnetism and superconductivity in Ba(Fe1-xCox)2As2 single crystals
• Single Impurity Problem in Iron-Pnictide Superconductors
• Breakdown of universal transport in correlated d-wave superconductors
• Unexpected weak spatial variation of local density of sates induced by individual Co impurity atoms in Na(Fe{1-x}Cox)As as revealed by scanning tunneling spectroscopy
• Magnetic impurities in the two-band $s_{\pm }$-wave superconductors
• Single Impurity Effects in Multiband Superconductors with Different Sign Order Parameters

Cited by in corpus (36)

• Using Gap Symmetry and Structure to Reveal the Pairing Mechanism in Fe-based Superconductors
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• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Enhancing Superconductivity by Disorder
• Visualization of atomic-scale phenomena in superconductors: application to FeSe
• Enhancing magnetic stripe order in iron pnictides by RKKY exchange interactions
• Unconventional disorder effects in correlated superconductors
• Emergent defect states as a source of resistivity anisotropy in the nematic phase of iron pnictides
• Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor ${\mathrm{FeTe}}_{0.55}{\mathrm{Se}}_{0.45}$
• Unconventional superconductivity protected from disorder on the kagome lattice
• Imaging the Real Space Structure of the Spin Fluctuations in an Iron-based superconductor
• Origin of electronic dimers in the spin-density wave phase of Fe-based superconductors
• Impact of Iron-site defects on Superconductivity in LiFeAs
• Towards a quantitative description of tunneling conductance of superconductors: application to LiFeAs
• Quantum phase transition of correlated iron-based superconductivity in LiFe${}_{1-x}$Co${}_x$As
• Theoretical study of impurity-induced magnetism in FeSe
• Supercurrents and spontaneous time-reversal symmetry breaking by nonmagnetic disorder in unconventional superconductors
• Spontaneous time-reversal symmetry breaking by disorder in superconductors
• Raising the critical temperature by disorder in unconventional superconductors mediated by spin fluctuations
• Revisiting superconductivity in the extended one-band Hubbard model: pairing via spin and charge fluctuations
• Visualization of local magnetic moments emerging from impurities in the Hund's metal states of FeSe
• Impact of topology on the impurity effects in extended $s$-wave superconductors with spin-orbit coupling
• Electronic vortex structure of Fe-based superconductors: application to LiFeAs
• Orbital superconductivity, defects and pinned nematic fluctuations in the doped iron chalcogenide FeSe${}_{0.45}$Te${}_{0.55}$
• 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
• Time-reversal symmetry breaking from lattice dislocations in superconductors
• Disorder-Induced Electronic Nematicity
• Orbital-selective correlations and renormalized electronic structure in LiFeAs
• Evolution of quasiparticle states with and without a Zn-impurity in doped 122 iron pnictides
• Disorder and Zeeman coupling induced gap-filling states in the nodeless chiral superconducting Bi/Ni bilayer system
• Superconducting gap symmetry from Bogoliubov quasiparticle interference analysis on {Sr}${}_2${RuO}${}_4$
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• Probing Sign-Changing Order Parameters via Impurity States in unconventional superconductors: Implications for La${}_3$Ni${}_2$O${}_7$ Superconductors with interlayer pairing
• Quasiparticle interference in LiFeAs: Signature of inelastic tunneling through spin fluctuations