Observation of Dirac Cone Electronic Dispersion in BaFe2As2

Details Observation of Dirac Cone Electronic Dispersion in BaFe2As2 Observation of Dirac Cone Electronic Dispersion in BaFe2As2

2009-09-03

arxiv.org/abs/0909.0574v1

Physical Review Letters 104, 137001 (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.104.137001

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

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