Orbital characters of bands in the iron-based superconductor BaFe1.85Co0.15As2

Abstract

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 BaFe 1.85 Co 0.15 As 2 by studying the polarization and photon-energy dependence of angle-resolved photoemission data. While the distributions of the d xz , d yz , and d 3z 2 −r 2 orbitals agree with the prediction of density functional theory, those of the d xy and d x 2 −y 2 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.

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Cite this paper

@inproceedings{Zhang2013OrbitalCO, title={Orbital characters of bands in the iron-based superconductor BaFe1.85Co0.15As2}, author={Y. Zhang and F. Chen and Chun Lei He and Baojing Zhou and B. P. Xie and Chen Fang and Wei-Yu Tsai and Xiuping Chen and Hiroaki Hayashi and D. L. Feng and J. Jiang and Hideaki Iwasawa and K. Shimada and Hirofumi Namatame and Masaki Taniguchi and Jiangping Hu}, year={2013} }