Dirac cone in iron-based high Tc superconductors
  The band structure of iron-based superconductors gives rise to yet another scenario for the appearance of Dirac fermions. A viewpoint on "Observation of Dirac cone electronic dispersion in BaFe2As2" (Richard et.al., PRL 104, 137001 (2010)). 
M. Zahid Hasan, B. Andrei Bernevig
cond-mat.supr-con cond-mat.str-el