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

Abstract

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.

5 pages, 4 figures. Accepted in Physical Review B (Rapid Communication)

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Cited by in corpus (10)

• Unconventional crystal structure of the high-pressure superconductor La${}_3$Ni${}_2$O${}_7$
• Direct Observation of Orbital Hybridisation in a Cuprate Superconductor
• Doping Dependence of Collective Spin and Orbital Excitations in Spin 1 Quantum Antiferromagnet La${}_{2-x}$Sr${}_x$NiO${}_4$ Observed by X-rays
• Effective crystal field and Fermi surface topology: a comparison of d- and dp-orbital models
• Two-dimensional type-II Dirac fermions in layered oxides
• Pseudogap-related charge dynamics in layered-nickelate R2-xSrxNiO4 (x sim 1)
• Orbital Symmetry and Orbital Excitations in High-$T_c$ Superconductors
• Strain-Tuned Magnetic Frustration in a Square Lattice $J_1$-$J_2$ Material
• Effects of reduced dimensionality, crystal field, electron-lattice coupling, and strain on the ground-state of a rare-earth nickelates monolayer
• Charge disproportionation and nano phase separation in $R$SrNiO${}_4$