Orbital Characters And Near Two-Dimensionality Of Fermi Surfaces In Nafe1-Xcoxas

We report a comprehensive study of orbital characters and tridimensional nature of the electronic bands of 111-family in Fe-pnictides superconductors, NaFe1-xCoxAs (x = 0 and 0.05), with angle-resolved photoemission spectroscopy. We determined the orbital characters and the k(z) dependence of the low-energy electronic structures by tuning the polarization and the energy of the incident photons. We observed two nearly two-dimensional hole-like Fermi surfaces (FS) near the Brillouin zone (BZ) center and two electron-like FS near BZ corner. The bands near the Fermi level (E-F) are mainly derived from the Fe 3d(xy); 3d(yz), and 3d(zx) orbitals. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4767374]