Electronic coupling in square planar La4Ni3O8
A study of a dd excitation in La4Ni3O8 (La-438) using x-ray absorption scattering (XAS) and resonant inelastic x-ray scattering (RIXS) at the Ni K-edge is presented here. 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1774530
- Journal Information:
- Journal of Physics. Condensed Matter, Vol. 32, Issue 42; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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