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The recent discovery of superconductivity in hole-doped planar nickelatesR1-xSrNiO2 (R=Pr,Nd) raises the foundational question of how the electronicstructure and electronic correlations of these Ni1+ compounds compare to thoseof the Cu2+ cuprate superconductors. Here, we present an Angle-ResolvedPhotoemission Spectroscopy (ARPES) study of the trilayer nickelate Pr4Ni3O8,revealing an electronic structure and Fermi surface very similar to that of thehole-doped cuprates but with a few critical differences. Specifically, the mainportions of the Fermi surface are extremely similar to that of the bilayercuprates, with an additional piece that can accommodate additional hole doping.We find that the electronic correlations are about twice as strong in thenickelates and are almost k-independent, indicating that they originate from alocal effect-likely the Mott interaction, whereas the cuprate interactions aresomewhat less local. Nevertheless, the nickelates still demonstrate anapproximately linear in energy and linear in temperature scattering rate.Understanding the similarities and differences between these two relatedfamilies of strongly-correlated novel superconductors is an importantchallenge.

Electronic structure and correlations in planar trilayer nickelate Pr4Ni3O8