ARPES observation of Mn-pnictide hybridization and negligible band structure renormalization in BaMn${}_2$As${}_2$ and BaMn${}_2$Sb${}_2$

Abstract

We performed an angle-resolved photoemission spectroscopy study of BaMn${}_2$As${}_2$ and BaMn${}_2$Sb${}_2$, which are isostructural to the parent compound BaFe${}_2$As${}_2$ 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 3$d$ 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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• Colossal band renormalization and stoner ferromagnetism induced by electron-antiferromagnetic-magnon coupling
• Putative hybridization gap in CaMn${}_2$Bi${}_2$ under applied pressure
• Novel polymorphic phase of BaCu2As2: impact of flux for new phase formation in crystal growth
• Linear magnetoelectricity in the Zintl phase pnictides (Ba, Ca, Sr)${\mathrm{Mn}}_2{(\mathrm{P},\mathrm{As},\mathrm{Sb})}_2$ from first principles calculations
• Magnetic-field-induced Anderson localization in orbital selective antiferromagnet BaMn${}_2$Bi${}_2$
• Local-moment magnetism in Mn-based pnictides