Position-dependent STM spectra in La2PrNi2O7 are computed from a two-orbital bilayer model, showing orbital-selective coherence peaks and impurity scattering that enable band identification.
Triplon-mediated pairing and the superconducting gap structure in bilayer nickelates
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abstract
We investigate the superconducting gap structure in bilayer nickelates within a model in which conduction bands of dx2-y2 symmetry coexist with localized d3z2-r2 spins. Strong interlayer coupling drives the local moments into a singlet ground state, whose virtual singlet-triplet excitations ("triplons") mediate the pairing interaction. This mechanism yields interband s+- pairing, with opposite signs of the order parameter on the two (alpha and beta) bands. The calculated tunneling spectra reproduce the recently observed two-peak structure, the larger gap on the alpha band despite its smaller density of states, and the gap anisotropy. The results provide strong evidence for the triplon-mediated pairing mechanism in bilayer nickelates.
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cond-mat.supr-con 2years
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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.
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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.