Symmetry analysis shows orbital hybridization vanishes along the BZ diagonal, allowing the gap on alpha/beta pockets to test d_x2-y2 vs d_z2 dominance; experiments and RPA favor Hund's rule mechanism with full gap.
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Oxygen content in La3Ni2O7+δ controls phase purity and directly tunes the superconducting Tc and upper critical field Hc2 of the bilayer phase.
Superconductivity in La3Ni2O7 arises from interlayer Cooper pairs of 3d_x2-y2 electrons driven by effective J_perp from Hund-assisted AFM exchange transfer, while localized 3d_z2 electrons form rung singlets that produce a pseudogap but no condensate.
citing papers explorer
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Regulating oxygen content and superconductivity in La$_3$Ni$_2$O$_{7+\delta}$
Oxygen content in La3Ni2O7+δ controls phase purity and directly tunes the superconducting Tc and upper critical field Hc2 of the bilayer phase.
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Superconductivity in bilayer La$_3$Ni$_2$O$_7$: A review focusing on the strong-coupling Hund's rule assisted pairing mechanism
Superconductivity in La3Ni2O7 arises from interlayer Cooper pairs of 3d_x2-y2 electrons driven by effective J_perp from Hund-assisted AFM exchange transfer, while localized 3d_z2 electrons form rung singlets that produce a pseudogap but no condensate.