The recent discovery of superconductivity under pressure in Ruddlesden-Popper (RP) nickelates has attracted a great deal of attention. Here, using charge-self-consistent density-functional theory plus dynamical mean-field theory, we study the correlated electronic structure of the latest superconducting member of the family: the alternating single-layer bilayer nickelate ${\mathrm{La}}_5{\mathrm{Ni}}_3{\mathrm{O}}_{11}$. Due to its alternating single-layer and bilayer structural motif, this hybrid RP nickelate exhibits layer-selective physics with the single-layer neighboring a Mott instability, rendering the bilayer the dominant contributor to its low-energy physics at both ambient and high pressure. The electronic structure of ${\mathrm{La}}_5{\mathrm{Ni}}_3{\mathrm{O}}_{11}$ ultimately resembles that of the bilayer compound ${\mathrm{La}}_3{\mathrm{Ni}}_2{\mathrm{O}}_7$, pointing to the presence of universal features in the family of superconducting RP nickelates. Thus, ${\mathrm{La}}_5{\mathrm{Ni}}_3{\mathrm{O}}_{11}$ provides a new platform to disentangle the key degrees of freedom underlying superconductivity in pressurized RP nickelates, underscoring the central role of the bilayer structural motif.

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• Electronic structure
• High-temperature superconductors
• Nickelates
• Density functional calculations
• Dynamical mean field theory