We have performed an angle-resolved photoemission spectroscopy (ARPES) study of the undoped and electron-doped iron pnictides BaFe2\_{-x}CoxAs2 (Ba122) (x=0, 0.14) and studied the Fermi surfaces (FSs) and band dispersions near the Fermi level. The FS sheets we observed are consistent with the shrinkage of the hole-like pockets around the Brillouin Zone (BZ) center and the expansion of the electron pockets around the BZ corner in the electron-doped compound as compared to the undoped parent compound. Band dispersions and FSs around the BZ center strongly depend on the photon energy, indicating the three-dimensional (3D) electronic structure. This observation suggests that the antiferromagnetism and superconductivity in the pnictides may have to be considered including the orbital-dependent 3D electronic structure, where FS nesting is not necessarily strong.
@article{arxiv.0906.1846,
title = {Three-dimensional electronic structure of superconducting iron pnictides observed by angle-resolved photoemission spectroscopy},
author = {Walid Malaeb and Teppei Yoshida and Atsushi Fujimori and Masato Kubota and Kanta Ono and Kunihiro Kihou and Parasharam M. Shirage and Hijiri Kito and Akira Iyo and Hiroshi Eisaki and Yasuyuki Nakajima and Tsuyoshi Tamegai and Ryotaro Arita},
journal= {arXiv preprint arXiv:0906.1846},
year = {2009}
}