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Like high Tc cuprates, the newly discovered iron based superconductors lie inclose proximity to a magnetically ordered parent phase. However, while themagnetic order in parent cuprates is known to derive from a spin-spin localsuperexchange interaction, a plethora of experiments including neutronscattering have so far been unable to conclusively resolve whether a localmoment Heisenberg description applies in parent iron based compounds, orwhether magnetism arises from a collective SDW order instability. These twoalternatives can in principle be distinguished by measuring the low energymomentum-resolved bulk-representative electronic structure of the magneticallyordered phase. Using a combination of polarization dependent ARPES and STM, wehave isolated the complete low-lying bulk representative electronic structureof magnetic SrFe2As2 with d-orbital symmetry specificity for the first time.Our results show that while multiple bands with different iron d-orbitalcharacter indeed contribute to charge transport, only one pair of bands withopposite mirror symmetries microscopically exhibit an itinerant SDW instabilitywith energy scales on the order of 50 meV. The orbital resolved band topologybelow T_SDW point uniquely to a nesting driven band hybridization mechanism ofthe observed antiferromagnetism in the iron pnictides, and is consistent withan unusual anisotropic nodal-density-wave state. In addition, these resultsplace strong constraints on many theories of pnictide superconductivity thatrequire a strict local moment magnetism starting point.

Experimental determination of the microscopic origin of magnetism in parent iron pnictides