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We use angle-resolved photoemission spectroscopy to study twinned anddetwinned iron pnictide compound NaFeAs. Distinct signatures of electronicreconstruction are observed to occur at the structural (TS) and magnetic (TSDW)transitions. At TS, C4 rotational symmetry is broken in the form of ananisotropic shift of the orthogonal dxz and dyz bands. The magnitude of thisorbital anisotropy rapidly develops to near completion upon approaching TSDW,at which temperature band folding occurs via the antiferromagnetic orderingwave vector. Interestingly, the anisotropic band shift onsetting at TS developsin such a way to enhance the nesting conditions in the C2 symmetric state,hence is intimately correlated with the long range collinear AFM order.Furthermore, the similar behaviors of the electronic reconstruction in NaFeAsand Ba(Fe1-xCox)2As2 suggests that this rapid development of large orbitalanisotropy between TS and TSDW is likely a general feature of the electronicnematic phase in the iron pnictides, and the associated orbital fluctuationsmay play an important role in determining the ground state properties.

Electronic reconstruction through the structural and magnetic transitions in detwinned NaFeAs