ARPES observation of Mn-pnictide hybridization and negligible band   structure renormalization in BaMn$_2$As$_2$ and BaMn$_2$Sb$_2$
  We performed an angle-resolved photoemission spectroscopy study of BaMn$_2$As$_2$ and BaMn$_2$Sb$_2$, which are isostructural to the parent compound BaFe$_2$As$_2$ of the 122 family of ferropnictide superconductors. We show the existence of a strongly $k_z$-dependent band gap with a minimum at the Brillouin zone center, in agreement with their semiconducting properties. Despite the half-filling of the electronic 3$d$ shell, we show that the band structure in these materials is almost not renormalized from the Kohn-Sham bands of density functional theory. Our photon energy dependent study provides evidence for Mn-pnictide hybridization, which may play a role in tuning the electronic correlations in these compounds. 
W.-L. Zhang, P. Richard, A. van Roekeghem, S.-M. Nie, N. Xu, P. Zhang,   H. Miao, S.-F. Wu, J.-X. Yin, B. B. Fu, L.-Y. Kong,...
cond-mat.supr-con cond-mat.str-el