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

Maria N. Gastiasoro; P. J. Hirschfeld; Brian M. Andersen

doi:10.1103/PhysRevB.89.100502

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

Maria N. Gastiasoro, P. J. Hirschfeld, Brian M. Andersen

DOI 10.1103/PhysRevB.89.100502 · Physical Review B

T1

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Abstract

We investigate emergent impurity-induced states arising from pointlike 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 (π,π) 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 ∼10 lattice constants, in excellent agreement with recent scanning tunneling experiments. These electronic dimers provide a natural explanation of the dopant-induced transport anisotropy found, e.g., in the 122 iron pnictides.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ca(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown