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YbNi crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Yb is bonded in a 7-coordinate geometry to seven equivalent Ni atoms. There are a spread of Yb–Ni bond distances ranging from 2.80–3.02 Å. Ni is bonded in a 9-coordinate geometry to seven equivalent Yb and two equivalent Ni atoms. Both Ni–Ni bond lengths are 2.33 Å.
Heavy fermion compounds exhibiting a ferromagnetic quantum critical point have attracted considerable interest. Common to two known cases, i.e., CeRh 6 Ge 4 and YbNi 4 P 2 , is that the 4f moments reside along chains with a large interchain distance, exhibiting strong magnetic anisotropy that was proposed to be vital for the ferromagnetic quantum criticality. Here, we report an angle-resolved photoemission study on CeRh 6 Ge 4 in which we observe sharp momentum-dependent 4f bands and clear bending of the conduction bands near the Fermi level, indicating considerable hybridization between conduction and 4f electrons. The extracted hybridization strength is anisotropic in momentum space and is obviously stronger along the Ce chain direction.The hybridized 4f bands persist up to high temperatures, and the evolution of their intensity shows clear band dependence. Our results provide spectroscopic evidence for anisotropic hybridization between conduction and 4f electrons in CeRh 6 Ge 4 , which could be important for understanding the electronic origin of the ferromagnetic quantum criticality.