Electronic and magnetic excitations in La₃Ni₂O₇.

ABSTRACT: High-temperature superconductivity was discovered in the pressurized nickelate La₃Ni₂O₇ which has a unique bilayer structure and mixed valence state of nickel. The properties at ambient pressure contain crucial information of the fundamental interactions and bosons mediating superconducting pairing. Here, using X-ray absorption spectroscopy and resonant inelastic X-ray scattering, we identified that Ni 3 dx2-y2 , Ni 3 dz2 , and ligand oxygen 2p orbitals dominate the low-energy physics with a small charge-transfer energy. Well-defined optical-like magnetic excitations soften into quasi-static spin-density-wave ordering, evidencing the strong electronic correlation and rich magnetic properties. Based on an effective Heisenberg spin model, we extract a much st

SUBMITTER: Chen X 

PROVIDER: S-EPMC11541582 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature