Friday, July 19, 2013

1307.4913 (Maria N. Gastiasoro et al.)

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

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