Cuprate-like Electronic Structures in Infinite-Layer Nickelates with Substantial Hole Dopings

Abstract

The superconducting infinite-layer (IL) nickelates offer a new platform for investigating the long-standing problem of high-temperature superconductivity. Many models were proposed to understand its superconducting mechanisms based on the calculated electronic structure, and the multiple Fermi surfaces and multiple orbitals involved create complications and controversial conclusions. Over the past 5 years, the lack of direct measurements of the electronic structure has hindered the understanding of nickelate superconductors. Here we fill this gap by directly resolving the electronic structures of the parent compound LaNiO${}_2$ and superconducting La${}_{0.8}$Ca${}_{0.2}$NiO${}_2$ using angle-resolved photoemission spectroscopy (ARPES). We find that their Fermi surfaces consist of a quasi-two-dimensional (quasi-2D) hole pocket and a three-dimensional (3D) electron pocket at the Brillouin zone corner, whose volumes change upon Ca doping. The Fermi surface topology and band dispersion of the hole pocket closely resemble those observed in hole-doped cuprates. However, the cuprate-like band exhibits significantly higher hole doping in superconducting La${}_{0.8}$Ca${}_{0.2}$NiO${}_2$ compared to superconducting cuprates, highlighting the disparities in the electronic states of the superconducting phase. Our observations highlight the novel aspects of the IL nickelates, and pave the way toward the microscopic understanding of the IL nickelate family and its superconductivity.

12 pages, 4 figures

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• Superconductivity and Electronic Structures of Nickelate Thin Film Superstructures
• Gigantic-oxidative atomic-layer-by-layer epitaxy for artificially designed complex oxides
• Dichotomy in Low- and High-energy Band Renormalizations in Trilayer Nickelate $L{a}_{4}N{i}_3{O}_{10}$: a Comparison with Cuprates
• Closing in on possible scenarios for infinite-layer nickelates: comparison of dynamical mean-field theory with angular-resolved photoemission spectroscopy
• Charge Stripe Manipulation of Superconducting Pairing Symmetry Transition
• Observation of Electride-like $s$ States Coexisting with Correlated $d$ Electrons in NdNiO${}_2$
• Local correlations necessitate waterfalls as a connection between quasiparticle band and developing Hubbard bands
• Nodeless superconducting gap and electron-boson coupling in (La,Pr,Sm)${}_3$Ni${}_2$O${}_7$ films
• Disorder-induced suppression of superconductivity in infinite-layer nickelates
• Superconducting phase diagram of finite-layer nickelates Nd${}_{n+1}$Ni${}_n$O${}_{2n+2}$
• Lattice dynamics of the infinite-layer nickelate LaNiO${}_2$
• Emergence and tunability of Fermi-pocket and electronic instabilities in layered Nickelates
• Achieving superconductivity in infinite-layer nickelate thin films by aluminum sputtering deposition
• Surfaces and interfaces of infinite-layer nickelates studied by dynamical mean-field theory