Resonant Inelastic X-Ray Scattering (RIXS) in SrCuO$_{2}$

TL;DR

This study investigates the RIXS spectra of SrCuO$_{2}$ near the Cu K-edge, revealing complex structures and dependencies on incident photon energy and momentum transfer, aligning qualitatively with theoretical predictions.

Contribution

The paper provides detailed experimental RIXS data on SrCuO$_{2}$ showing energy and momentum transfer dependencies, demonstrating the potential of high-brilliance X-ray sources for studying transition metal compounds.

Findings

RIXS spectra show complex structures dependent on incident photon energy and momentum transfer.

Spectral weight shifts toward larger loss-energy with increasing incident photon energy.

Energy of inelastic loss peak depends on momentum transfer, consistent with theoretical models.

Abstract

The resonant inelastic x-ray scattering (RIXS) was measured in an insulating SrCuO$_{2}$ with changing the incident photon energy ($h\nu$) near the Cu $1s$ absorption edge (K-edge). Complex structures and their dependences on the momentum transfer($\Delta k$) and $h\nu$ were observed. The $h\nu$ dependence of the RIXS spectra measured for a constant $\Delta k$=2.4$\pi$ has shown a remarkable enhancement near the absorption maximum and a shift of the spectral weight toward larger loss-energy with increasing $h\nu$. Also, the energy of the inelastic loss peak in the RIXS spectra for the fixed excitation at 8.993 keV, 10 eV below the absorption maximum, has shown a clear dependence on $\Delta k$. These results are in a qualitative agreement with a theoretical prediction. Full utilization of the potential of the high brilliance X ray light source at BL19LXU of SPring-8 with 27 m long insertion device will open up a breakthrough in RIXS for heavy transition metal compounds in accordance with the improvement in focussing and analyzing elements.