3D band structure determination of BaFe2As2, CaFe2As2 and SrFe2As2

The band structure of the parent compounds of iron-arsenic superconductors BaFe2As2, CaFe2As2 and SrFe2As2 are investigated by angle-resolved photoemission spectroscopy. The dispersion of predominant Fe 3d bands has been successfully resolved and compared with theoretical calculations. Although the overall band structure is in line with nonmagnetic DFT computations, the Fe 3d band dispersions strongly deviate from calculations, and the Fermi surface topology differs from theoretical results. These results suggest that some significant correlations have not been correctly involved in the current understanding of these new materials. The kz dependence of the band structure has also been studied for these quasi-2D materials.