Fig. 1
From: Unique crystal field splitting and multiband RKKY interactions in Ni-doped EuRbFe4As4
Crystal structure and crystal field splitting. a Crystal structure of EuRbFe4As4. b FeAs-layer centered on Fe atom. Compared with 122-type EuFe2As2, the Rb-substitution breaks not only the (1/2 1/2 1/2) gliding symmetry but also the S4 symmetry
