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Electronic coupling in square planar La4Ni3O8

A study of a dd excitation in La4Ni3O8 (La-438) using x-ray absorption scattering and resonant inelastic x-ray scattering (RIXS) at the Ni K-edge is presented. The incident energy dependence of this dd excitation shows a maximum at the 1s → 4pπ transition. Its intensity at the main edge is proportional to the amount of incident x-ray polarization parallel to the c-axis. These observations suggest that the RIXS process underlying this excitation includes a strong Ni 3d-Ni 4p Coulomb interaction and excludes the ‘4p-as-spectator’ approximation. The dominant Ni 3d Coulomb interaction is with Ni 4pπ with limited or no interaction with the Ni 4pσ. An insulating gap closing is observed as a function of temperature.