Journal
PHYSICAL REVIEW B
Volume 94, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.155155
Keywords
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Funding
- MOST [2011CBA001000, 2011CBA00102, 2012CB821403, 2013CB921703, 2015CB921301, 2016YFA0300300, 2016YFA0401000]
- NSFC from China [11004232, 11034011/A0402, 11234014, 11274362, 11674371, 11504117]
- Grant of European Research Council [617196]
- University of Wisconsin-Madison
- Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
- [t2016091393]
- European Research Council (ERC) [617196] Funding Source: European Research Council (ERC)
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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 k(z)-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.
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