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Is BaCr$_2$As$_2$ symmetrical to BaFe$_2$As$_2$ with respect to half $3d$ shell filling?

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arxiv 1701.07591 v2 pith:SRXHOMOP submitted 2017-01-26 cond-mat.supr-con cond-mat.str-el

P. Richard , A. van Roekeghem , B. Q. Lv , T. Qian , T. K. Kim , M. Hoesch , J.-P. Hu , Athena S. Sefat
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Silke Biermann H. Ding
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classification cond-mat.supr-concond-mat.str-el
keywords bafebacrbandbandsfermirenormalizationsurfaceangle-resolved
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abstract

We have performed an angle-resolved photoemission spectroscopy study of BaCr$_2$As$_2$, which has the same crystal structure as BaFe$_2$As$_2$, 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 BaFe$_2$As$_2$, and to a larger contribution of the $e_g$ 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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