Unconventional superconductivity without doping: infinite-layer nickelates under pressure

Abstract

High-temperature unconventional superconductivity quite generically emerges from doping a strongly correlated parent compound, often (close to) an antiferromagnetic insulator. The recently developed dynamical vertex approximation is a state-of-the-art technique that has quantitatively predicted the superconducting dome of nickelates. Here, we apply it to study the effect of pressure in the infinite-layer nickelate Sr${}_x$Pr${}_{1-x}$NiO${}_2$. We reproduce the increase of the critical temperature ($T_c$) under pressure found in experiment up to 12 GPa. According to our results, $T_c$ can be further increased with higher pressures. Even without Sr-doping the parent compound, PrNiO${}_2$, will become a high-temperature superconductor thanks to a strongly enhanced self-doping of the \nidxsqysq{} orbital under pressure. With a maximal \Tc{} of 100\,K around 100\,GPa, nickelate superconductors can reach that of the best cuprates.

Main text: 6 pages, 4 figures. Supplementary information: 18 pages, 16 figures

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Cited by in corpus (11)

• Superconductivity in PrNiO2 infinite-layer nickelates
• Superconductivity in the parent infinite-layer nickelate NdNiO${}_2$
• Closing in on possible scenarios for infinite-layer nickelates: comparison of dynamical mean-field theory with angular-resolved photoemission spectroscopy
• Observation of Electride-like $s$ States Coexisting with Correlated $d$ Electrons in NdNiO${}_2$
• Magnetism-Enhanced Strong Electron-Phonon Coupling in Infinite-Layer Nickelate
• Local correlations necessitate waterfalls as a connection between quasiparticle band and developing Hubbard bands
• Electronic correlations and spin-charge-density stripes in double-layer La${}_3$Ni${}_2$O${}_7$
• Superconducting phase diagram of finite-layer nickelates Nd${}_{n+1}$Ni${}_n$O${}_{2n+2}$
• Comparison of superconducting pairing in doped cuprates and nickelates within an extended Hubbard model
• Pressure effects on the electronic structure and magnetic properties of infinite-layer nickelates
• Emergence and tunability of Fermi-pocket and electronic instabilities in layered Nickelates