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Electronic and magnetic excitations in La$_3$Ni$_2$O$_7$
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abstract
The striking discovery of high-temperature superconductivity (HTSC) of 80 K in a bilayer nickelate La$_3$Ni$_2$O$_7$ under a moderately high pressure of about 14 GPa ignited a new wave of studying HTSC in nickelates. The properties of the parental phase at ambient pressure may contain key information on basic interactions therein and bosons that may mediate pairing giving birth to superconductivity. Moreover, the bilayer structure of La$_3$Ni$_2$O$_7$ may suggest a distinct minimal model in comparison to cuprate superconductors. Here using X-ray absorption spectroscopy and resonant inelastic X-ray scattering, we studied La$_3$Ni$_2$O$_7$ at ambient pressure, and found that Ni 3$d_{x^2-y^2}$, Ni 3$d_{z^2}$, and ligand oxygen 2$p$ orbitals dominate the low-energy physics with a small charge-transfer energy. Remarkably, well-defined optical-like magnetic excitations were found to soften into a quasi-static spin-density-wave ordering, evidencing the strong electronic correlations and rich magnetic properties. Based on a Heisenberg spin model, we found that the inter-layer effective magnetic superexchange interaction is much larger than the intra-layer ones, and proposed two viable magnetic structures. Our results set the foundation for further exploration of La$_3$Ni$_2$O$_7$ superconductor.
Forward citations
Cited by 7 Pith papers
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Magnetic Order in bilayer Ruddlesden-Popper Nickelates
Combining superexchange with RKKY interactions between orbital-selective local moments reproduces the (π/2,π/2) magnetic order and ~80 meV spin excitations of bilayer nickelate La₃Ni₂O₇.
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Spin-density wave and superconductivity in La$_4$Ni$_3$O$_{10}$ under ambient pressure
In La4Ni3O10 at ambient pressure, a stripe spin-density wave with wave vector near (0.7π,0) is driven by Hund's coupling, and hole doping around δ=-0.4 is predicted to induce superconductivity.
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Strongly Anisotropic Charge Dynamics in La3Ni2O7 with Coherent-to-Incoherent Crossover of Interlayer Charge Dynamics
In La3Ni2O7, in-plane charge transport stays coherent from 10 to 300 K, while interlayer transport switches from coherent to incoherent as temperature rises toward 300 K.
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Evolution of Electronic Correlations in the Ruddlesden-Popper Nickelates
Optical measurements show electronic correlations weaken with increasing NiO6 layers in Ruddlesden-Popper nickelates, placing only the bilayer near a Mott transition.
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Low-temperature mean valence of nickel ions in pressurized La$_3$Ni$_2$O$_7$
Nickel valence in La3Ni2O7 stays close to 2.5+ from ambient pressure to 40 GPa at 20 K, so pressure-induced superconductivity is tied to a structural transition rather than a change in nickel charge.
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Unveiling the multiband metallic nature of the normal state in nickelate La3Ni2O7
Magnetoresistance of pressurized La3Ni2O7 follows a quasi-quadratic field dependence and extended Kohler scaling, leading the authors to conclude the normal state is a multiband metal.
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Dynamic charge order from strong correlations in the cuprates
A focused review arguing that dynamic charge order correlations measured by RIXS in cuprates reflect long-range Coulomb interactions, with quasi-circular patterns (QCDCs) linked to strange metal scattering.
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