Electronic structure of optimally doped pnictide Ba0.6K0.4Fe2As2: a comprehensive angle-resolved photoemission spectroscopy investigation

• Published in: Journal of physics. Condensed matter 2011-04, Vol.23 (13), p.135701-135701
• Main Authors: Ding, H, Nakayama, K, Richard, P, Souma, S, Sato, T, Takahashi, T, Neupane, M, Xu, Y-M, Pan, Z-H, Fedorov, A V, Wang, Z, Dai, X, Fang, Z, Chen, G F, Luo, J L, Wang, N L
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron density of states and band structure of crystalline solids; Electron states; Electronics - instrumentation; Electrons; Exact sciences and technology; Fermi surface: calculations and measurements; effective mass, g factor; Methods of electronic structure calculations; Models, Theoretical; Other inorganic compounds; Photoelectron Spectroscopy - methods; Physics
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/23/13/135701

The electronic structure of the Fe-based superconductor Ba(0.6)K(0.4)Fe(2)As(2) is studied by means of angle-resolved photoemission. We identify dispersive bands crossing the Fermi level forming hole-like (electron-like) Fermi surfaces (FSs) around Γ (M) with nearly nested FS pockets connected by the antiferromagnetic wavevector. Compared to band structure calculation findings, the overall bandwidth is reduced by a factor of 2 and the low energy dispersions display even stronger mass renormalization. Using an effective tight banding model, we fitted the band structure and the FSs to obtain band parameters reliable for theoretical modeling and calculation of physical quantities.