Fig. 2
From: Unique crystal field splitting and multiband RKKY interactions in Ni-doped EuRbFe4As4
Electronic band structure and density of states. a Electronic band structure of EuRbFe4As4 (red line) compared with CaRbFe4As4 (black line). b Electronic band structure of BaFe2As2 (blue line) in paramagnetic state in the folded Brillouin zone. The green dotted line denotes the Fermi level, which is aligned at zero. The degenerate points at X point as indicated by red circles in BaFe2As2 are removed in the 1144-system. c Spin-resolved band structure of EuRbFe4As4 in ferromagnetic state. The red and blue lines correspond to the two spin channels respectively. d Projected band structure of EuRbFe4As4 (ferromagnetic phase) for majority-spin channel around Fermi level. The size of the red, turquoise, blue, and gray circles is proportional to the contributions from the dx(y)z, dxy, \(d_{z^2}\) and \(d_{x^2 - y^2}\) respectively. e Total electronic density of state and projected density of state of EuRbFe4As4.The black, red, blue, and turquoise lines represent the total density of state, the projected density of state for Fe-d, As-p, and Eu-f orbitals respectively. The Fermi level is aligned at zero
