Angle-resolved photoemission observation of Mn-pnictide hybridization and negligible band structure renormalization in BaMn2As2 and BaMn2Sb2

We performed an angle-resolved photoemission spectroscopy study of BaMn2As2 and BaMn2Sb2, which are isostructural to the parent compound BaFe2As2 of the 122 family of ferropnictide superconductors. We show the existence of a strongly kz-dependent band gap with a minimum at the Brillouin zone center,...

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Bibliographic Details
Published in:Physical review. B 2016-10, Vol.94 (15), p.155155
Main Authors: Zhang, W-L, Richard, P, van Roekeghem, A, Nie, S-M, Xu, N, Zhang, P, Miao, H, Wu, S-F, Yin, J-X, Fu, B Fu, Kong, L-Y, Qian, T, Wang, Z-J, Fang, Z, Sefat, A S, Biermann, S, Ding, H
Format: Article
Language:English
Subjects:
Band structure of solids
Band theory
Bands
Brillouin zones
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Density functional theory
Group 5A compounds
Photoelectric emission
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Summary:We performed an angle-resolved photoemission spectroscopy study of BaMn2As2 and BaMn2Sb2, which are isostructural to the parent compound BaFe2As2 of the 122 family of ferropnictide superconductors. We show the existence of a strongly kz-dependent band gap with a minimum at the Brillouin zone center, in agreement with their semiconducting properties. Despite the half filling of the electronic 3d shell, we show that the band structure in these materials is almost not renormalized from the Kohn-Sham bands of density functional theory. Our photon-energy-dependent study provides evidence for Mn-pnictide hybridization, which may play a role in tuning the electronic correlations in these compounds.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.94.155155