  The three-dimensional Fermi surface structure of hole-doped metallic layered
nickelate Eu2-xSrxNiO4 (x=1.1), an important counterpart to the isostructural
superconducting cuprate La2-xSrxCuO4, is investigated by energy-dependent
soft-x-ray angle-resolved photoemission spectroscopy. In addition to a large
cylindrical hole Fermi surface analogous to the cuprates, we observe a
Gamma-centered 3z2-r2-derived small electron pocket. This finding demonstrates
that in the layered nickelate the 3z2-r2 band resides close to the x2-y2 one in
energy. The resultant multi-band feature with varying orbital character as
revealed may strongly work against the emergence of the high-temperature
superconductivity.
