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 BaFe1.85Co0.15As2 by studying the polarization and photon-energy dependence of angle-resolved photoemission data. While the distributions of the d(xz), d(yz), and d(3z2-r2) orbitals agree with the prediction of density functional theory, those of the d(xy) and d(x2-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.
Published in:
Physical Review B 83,5 (2011)
Link to original published article:
http://dx.doi.org/10.1103/PhysRevB.83.054510
Date of Version
February 2011
Recommended Citation
Zhang, Y.; Chen, F.; He, C.; Zhou, B.; Xie, B. P.; Fang, C.; Tsai, W. F.; Chen, X. H.; Hayashi, H.; Jiang, J.; Iwasawa, H.; Shimada, K.; Namatame, H.; Taniguchi, M.; Hu, J. P.; and Feng, D. L., "Orbital characters of bands in the iron-based superconductor BaFe1.85Co0.15As2" (2011). Department of Physics and Astronomy Faculty Publications. Paper 1355.
https://docs.lib.purdue.edu/physics_articles/1355