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We performed an angle-resolved photoemission spectroscopy study of BaFe2As2,which is the parent compound of the so-called 122 phase of the iron-pnictidehigh-temperature superconductors. We reveal the existence of a Dirac cone inthe electronic structure of this material below the spin-density-wavetemperature, which is responsible for small spots of high photoemissionintensity at the Fermi level. Our analysis suggests that the cone is slightlyanisotropic and its apex is located very near the Fermi level, leading to tinyFermi surface pockets. Moreover, the bands forming the cone show an anisotropicleading edge gap away from the cone that suggests a nodal spin-density-wavedescription.

Observation of Dirac Cone Electronic Dispersion in BaFe2As2