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This work describes systematic strongly correlated electronic structure calculations for the candidate double-layer high-temperature superconductor La₃Ni₂O₇ under pressure. These reveal the localized-itinerant duality of Ni dₙ^{2} electrons, flat dₙ^{2} and dₗ^{2-y^2} quasiparticle bands, and strong interlayer antiferromagnetic correlations due to the interplay of orbital-selective Mott, Hund, and Kondo physics. These results imply a two-component theory with possibly preformed interlayer pairing for the high-temperature superconductivity in pressurized La₃Ni₂O₇. The strange metallicity in the normal state is also explained from the quasiparticle lifetimes.
Cao et al. (Thu,) studied this question.