2009/04/30 by Y. Zhang, Yiting Zhang, F. Chen +22
Materials Science · Physics and Astronomy · #Iron-based superconductors research #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.83.054510
published as Phys. Rev. B 83, 054510 (2011) · 7 pages, 8 figures, Add new data and detail results
arxiv created 2010/11/17 · openalex publication_date 2011/02/22 · arxiv updated 2011/02/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The unconventional superconductivity in the newly discovered iron-based superconductors is intimately related to its multiband/multiorbital nature. Here we report the comprehensive orbital characters of the low-energy three-dimensional electronic structure in BaFe1.85Co0.15As2 by studying the polarization and photon-energy dependence of angle-resolved photoemission data. While the distributions of the dxz, dyz, and d_3z2\ensuremath-r2 orbitals agree with the prediction of density functional theory, those of the dxy and d_x2\ensuremath-y2 orbitals show remarkable disagreement with theory. Our results point out the inadequacy of the existing band structure calculations and, more importantly, provide a foundation for constructing the correct microscopic model of iron pnictides.