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arXiv · 2311.06195

Unconventional superconductivity without doping: infinite-layer nickelates under pressure

Simone Di Cataldo·Paul Worm·Jan Tomczak·Liang Si·Karsten Held
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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.

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Simone Di Cataldo, Paul Worm, Jan Tomczak, Liang Si, Karsten Held. 2023-11-10. Unconventional superconductivity without doping: infinite-layer nickelates under pressure. https://doi.org/10.1038/s41467-024-48169-5

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