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To elucidate the role played by the transition metal ion in the pnictidematerials, we compare the electronic and magnetic properties of BaFe_{2}As_{2}with BaMn_{2}As_{2}. To this end we employ the LDA+Gutzwiller method to analyzethe mass renormalizations and the size of the ordered magnetic moment of thetwo systems. We study a model that contains all five transition metal 3dorbitals together with the Ba-5d and As-4p states (ddp-model) and compare theseresults with a downfolded model that consists of Fe/Mn d-states only (d-model).Electronic correlations are treated using the multiband Gutzwillerapproximation. The paramagnetic phase has also been investigated usingLDA+Gutzwiller method with electron density self-consistency. Therenormalization factors for the correlated Mn 3d orbitals in the paramagneticphase of BaMn_{2}As_{2} are shown to be generally smaller than those ofBaFe_{2}As_{2}, which indicates that BaMn_{2}As_{2} has stronger electroncorrelation effect than BaFe_{2}As_{2}. The screening effect of the main As 4pelectrons to the correlated Fe/Mn 3d electrons is evident by the systematicshift of the results to larger Hund's rule coupling J side from the ddp-modelcompared with those from the d-model. A gradual transition from paramagneticstate to the antiferromagnetic ground state with increasing J is obtained forthe models of BaFe_{2}As_{2} which has a small experimental magnetic moment;while a rather sharp jump occurs for the models of BaMn_{2}As_{2}, which has alarge experimental magnetic moment. The key difference between the two systemsis shown to be the d-level occupation. BaMn_{2}As_{2}, with approximately fived-electrons per Mn atom, is for same values of the electron correlations closerto the transition to a Mott insulating state than BaFe_{2}As_{2}. Here anorbitally selective transition, required for a system with close to sixelectrons only occurs at significantly larger values for the Coulombinteractions.

A comparative study of the electronic and magnetic properties of BaFe_2As_2 and BaMn_2As_2 using the Gutzwiller approximation