arXiv 1701.075912017-01cond-mat.supr-concond-mat.str-el

BaCr $_2$ As $_2$是否与BaFe $_2$ As $_2$对称（就半$3d$壳体填充而言）？

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

P. Richard, A. van Roekeghem, B. Q. Lv, T. Qian, T. K. Kim, M. Hoesch, J. -P. Hu, Athena S. Sefat, Silke Biermann, H. Ding

备注：: Extended discussion. 6 pages, 4 figures. This is authors version. The published version can be found at https://journals.aps.org/prb/
发表信息：: Phys. Rev. B 95, 184516 (2017)
DOI：: 10.1103/PhysRevB.95.184516

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摘要：

我们进行了角分辨光电子能谱研究BaCr $_2$ As $_2$，它具有相同的晶体结构的BaFe $_2$ As $_2$，铁基超导体的母体化合物。我们确定这种材料的费米面和它的能带色散超过5 eV的结合能。只有两个带观察到非常温和的带重整化（1.35）。我们把这个小的重整化，以增强直接交换相比，铁在BaFe $_2$作为$_2$，和一个更大的贡献的$e_g$轨道的组成中的频带形成的费米面，导致有效的价数减少由Fe $d$ -作为$p$杂交。

英文摘要：

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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