The three-dimensional Fermi-surface structure of hole-doped metallic layered nickelate Eu 2-xSr xNiO 4 (x=1.1), an important counterpart to the isostructural superconducting cuprate La 2-xSr xCuO 4, 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 Γ-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 multiband feature with varying orbital character as revealed may strongly work against the emergence of the high-temperature superconductivity.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2011 Dec 19|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics