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From a combination of high resolution angle-resolved photoemissionspectroscopy and density functional calculations, we show that BaFe2As2possesses essentially two-dimensional electronic states, with a strong changeof orbital character of two of the Gamma-centered Fermi surfaces as a functionof kz. Upon Co doping, the electronic states in the vicinity of the Fermi leveltake on increasingly three-dimensional character. Both the orbital variationwith kz and the more three-dimensional nature of the doped compounds haveimportant consequences for the nesting conditions and thus possibly also forthe appearance of antiferromagnetic and superconducting phases.

physical review. b, condensed matter and materials physics

Orbital character variation of the Fermi surface and doping dependent  changes of the dimensionality in BaFe2-xCoxAs2 from angle-resolved  photoemission spectroscopy