Is BaCr2As2 symmetrical to BaFe2As2 with respect to half 3d shell filling?
Abstract
We have performed an angle-resolved photoemission spectroscopy study of BaCr2As2, which has the same crystal structure as BaFe2As2, a parent compound of Fe-based superconductors. We determine the Fermi surface of this material and its band dispersion over 5 eV of binding energy. Very moderate band renormalization (1.35) is observed for only two bands. We attribute this small renormalization to enhanced direct exchange as compared to Fe in BaFe2As2, and to a larger contribution of the eg orbitals in the composition of the bands forming the Fermi surface, leading to an effective valence count that is reduced by Fe d - As p hybridization.
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