Abstract
We performed an angle-resolved photoemission spectroscopy study of , 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. The bands forming the cone show an anisotropic leading edge gap away from the cone that suggests a nodal spin-density-wave description.
- Received 3 September 2009
DOI:https://doi.org/10.1103/PhysRevLett.104.137001
©2010 American Physical Society
Viewpoint
Dirac cone in iron-based superconductors
Published 29 March 2010
The band structure of iron-based superconductors gives rise to yet another scenario for the appearance of Dirac fermions.
See more in Physics