Charge dynamics in strongly correlated one-dimensional Cu-O chain systems revealed by inelastic X-ray scattering

TL;DR

This study uses high-resolution inelastic X-ray scattering to explore charge excitations in one-dimensional Cu-O systems, revealing detailed electronic structures and hybridization effects in different atomic arrangements.

Contribution

It provides new insights into the charge dynamics and electronic hybridization in 1D Cu-O systems through detailed RIXS measurements and comparison with theory.

Findings

Revealed fine structures in RIXS spectra of Cu-O chains.

Clarified the nature of low-energy charge excitations.

Demonstrated the impact of atomic arrangement on electronic states.

Abstract

We report on the Cu 1s resonant inelastic X-ray scattering (RIXS) of Cu-O one-dimensional (1D) strongly correlated insulator systems with contrasting atomic arrangements, namely edge-sharing CuGeO3 and corner-sharing Sr2CuO3. Owing to good statistics of the high-resolution RIXS data, so far unresolved fine structures are revealed. Detailed photon-energy and momentum dependence of the RIXS spectra in comparison with theoretical calculations has clarified the natures of the low-energy charge excitations and hybridization of the electronic states.