Preempted phonon-mediated superconductivity in the infinite-layer nickelates

Abstract

Nickelate superconductors are outstanding materials with intriguing analogies with the cuprates. These analogies suggest that their superconducting mechanism may be unconventional, although this fundamental question is currently under debate. Here, we scrutinize the role played by electronic correlations in enhancing the electron-phonon coupling in the infinite-layer nickelates and the extent to which this may promote superconductivity. Specifically, we use $ab$ $initio$ many-body perturbation theory to perform state-of-the-art $GW$ and Eliashberg-theory calculations. We find that the electron-phonon coupling is effectively enhanced compared to density-functional-theory calculations. This enhancement may lead to low-$T_c$ superconductivity in the parent compounds already. However, it remains marginal in the sense that it cannot explain the record $T_c$s obtained with doping. This circumstance implies that conventional superconductivity is preempted by another pairing mechanism in the infinite-layer nickelates.

6 pages, 4 figures, 1 table + Supplementary Information

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Cited by in corpus (10)

• Superconductivity in pressurized trilayer La${}_4$Ni${}_3$O${}_{10-\delta }$ single crystals
• Ultrafast Dynamics of Bilayer and Trilayer Nickelate Superconductors
• Two-gap superconductivity and decisive role of rare-earth $d$ electrons in infinite-layer nickelates
• Unconventional superconductivity without doping: infinite-layer nickelates under pressure
• Dichotomy in Low- and High-energy Band Renormalizations in Trilayer Nickelate $L{a}_{4}N{i}_3{O}_{10}$: a Comparison with Cuprates
• Electron-phonon mediated superconductivity in La${}_6$Ni${}_5$O${}_{12}$ nickel oxides
• Magnetism-Enhanced Strong Electron-Phonon Coupling in Infinite-Layer Nickelate
• Lattice dynamics of the infinite-layer nickelate LaNiO${}_2$
• Pressure and doping effects on the electronic structure and magnetism of the single-layer nickelate La${}_2$NiO${}_4$
• Hubbard-$U$-corrected electron-phonon interactions in strongly correlated materials via the finite-displacement method