# Charge Excitations in Nd$_{2-x}$Ce$_x$CuO$_4$ Observed with Resonant Inelastic X-ray Scattering: Comparison of Cu K-edge with Cu L$_3$-edge

## TL;DR

This study uses resonant inelastic X-ray scattering to compare charge excitations in Nd$_{2-x}$Ce$_x$CuO$_4$ at Cu K-edge and L$_3$-edge, revealing consistent excitations across both edges.

## Contribution

It demonstrates that charge excitations observed at Cu K-edge and L$_3$-edge are identical in Nd$_{2-x}$Ce$_x$CuO$_4$, confirming the equivalence of these RIXS measurements.

## Key findings

- Charge excitations are consistent at both edges.
- Peak position and width match across edges.
- Same charge excitations observed in Nd$_{2-x}$Ce$_x$CuO$_4$.

## Abstract

We report a Cu K-edge resonant inelastic x-ray scattering (RIXS) study of momentum-dependent charge excitations in Nd$_{2-x}$Ce$_x$CuO$_4$ ($x$ = 0.075 and 0.18). The peak position and width of the excitations coincide excellently with those observed in Cu L$_3$-edge RIXS. It demonstrates that the same charge excitations are observed at the two edges.