Origin of electronic dimers in the spin-density wave phase of Fe-based superconductors

Abstract

We investigate the emergent impurity-induced states arising from point-like scatterers in the spin-density wave phase of iron-based superconductors within a microscopic five-band model. Independent of the details of the band-structure and disorder potential, it is shown how stable magnetic (pi,pi) unidirectional nematogens are formed locally by the impurities. Interestingly, these nematogens exhibit a dimer structure in the electronic density, are directed along the antiferromagnetic a-axis, and have typical lengths of order 10 lattice constants in excellent agreement with recent scanning tunnelling experiments. These electronic dimers provide a natural explanation of the dopant-induced transport anisotropy found e.g. in the 122 iron pnictides.

5 pages, 4 figures

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• Inter-orbital nematicity and the origin of a single electron Fermi pocket in FeSe
• Effect of weak disorder on the phase competition in iron pnictides
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• In-plane anisotropy of transport coefficients in the electronic nematic states: Universal origin of the nematicity in Fe-based superconductors
• Memory function approach to in-plane anisotropic resistivity in the antiferromagnetic phase of iron arsenide superconductors
• Isotropic Quenched Disorder Triggers a Robust Nematic State in Electron-Doped Pnictides
• Theoretical investigation of the electronic and magnetic properties of the orthorhombic phase of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Highly anisotropic quasiparticle interference patterns in the spin-density wave state of the iron pnictides
• Local magnetization nucleated by non-magnetic impurities in Fe-based superconductors
• Disorder-Induced Electronic Nematicity
• Robust superconductivity and fragile magnetism induced by the strong Cu impurity scattering in the high-pressure phase of FeSe
• Defect states in LiFeAs as seen by low temperature scanning tunneling microscopy and spectroscopy
• Nematic order driven by superconducting correlations
• Nematicity in LaFeAsO single crystals studied by elastoresistance, high-resolution thermal expansion and shear-modulus measurements