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The three-dimensional Fermi surface structure of hole-doped metallic layerednickelate Eu2-xSrxNiO4 (x=1.1), an important counterpart to the isostructuralsuperconducting cuprate La2-xSrxCuO4, is investigated by energy-dependentsoft-x-ray angle-resolved photoemission spectroscopy. In addition to a largecylindrical hole Fermi surface analogous to the cuprates, we observe aGamma-centered 3z2-r2-derived small electron pocket. This finding demonstratesthat in the layered nickelate the 3z2-r2 band resides close to the x2-y2 one inenergy. The resultant multi-band feature with varying orbital character asrevealed may strongly work against the emergence of the high-temperaturesuperconductivity.

Orbital characters of three-dimensional Fermi surfaces in Eu2-xSrxNiO4 as probed by soft-x-ray angle-resolved photoemission spectroscopy