Electronic Structure of Superconducting Infinite-Layer Lanthanum Nickelates

Abstract

Revealing the momentum-resolved electronic structure of infinite-layer nickelates is essential for understanding this new class of unconventional superconductors, but has been hindered by the formidable challenges in improving the sample quality. In this work, we report for the first time the angle-resolved photoemission spectroscopy of superconducting La${}_{0.8}$Sr${}_{0.2}$NiO${}_2$ films prepared by molecular beam epitaxy and $\text{in situ}$ atomic-hydrogen reduction. The measured Fermi topology closely matches theoretical calculations, showing a large Ni-$d_{x^2-y^2}$ derived Fermi sheet that evolves from hole-like to electron-like along $k_z$, and a three-dimensional (3D) electron pocket centered at Brillouin zone corner. The Ni-$d_{x^2-y^2}$ derived bands show a mass enhancement ($m^{\ast }/m_{\mathrm{DFT}}$) of 2-3,while the 3D electron band shows negligible band renormalization. Moreover, the Ni-$d_{x^2-y^2}$ derived states also display a band dispersion anomaly at higher binding energy, reminiscent of the waterfall feature and kinks observed in cuprates.

29 pages,13 figures

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Cited by in corpus (16)

• Angle-resolved photoemission spectroscopy of superconducting (La,Pr)3Ni2O7/SrLaAlO4 heterostructures
• Recent progress in nickelate superconductors
• Gigantic-oxidative atomic-layer-by-layer epitaxy for artificially designed complex oxides
• Superconductivity and Electronic Structures of Nickelate Thin Film Superstructures
• Dichotomy in Low- and High-energy Band Renormalizations in Trilayer Nickelate $L{a}_{4}N{i}_3{O}_{10}$: a Comparison with Cuprates
• Observation of Electride-like $s$ States Coexisting with Correlated $d$ Electrons in NdNiO${}_2$
• Magnetism-Enhanced Strong Electron-Phonon Coupling in Infinite-Layer Nickelate
• Disorder-induced suppression of superconductivity in infinite-layer nickelates
• Nodeless superconducting gap and electron-boson coupling in (La,Pr,Sm)${}_3$Ni${}_2$O${}_7$ films
• Superconducting phase diagram of finite-layer nickelates Nd${}_{n+1}$Ni${}_n$O${}_{2n+2}$
• Lattice dynamics of the infinite-layer nickelate LaNiO${}_2$
• Orbital-selective spin-triplet superconductivity in infinite-layer LaNiO${}_2$
• Mott Criticality as the Confinement Transition of a Pseudogap-Mott Metal
• Mesoscale variations of chemical and electronic landscape on the surface of Weyl semimetal Co${}_3$Sn${}_2$S${}_2$ visualized by ARPES and XPS
• 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