Figure 4

(a) Simulated RIXS spectra with varying 4f–4f Coulomb interactions. The amount of variation relative to the baseline parameters is listed in the figure. (b) Relative peak positions plotted against the ones with 0% variation (thick line) in 4f–4f Coulomb interactions. The highlighted straight lines are guides for eyes. The percentage of variation in 4f–4f Coulomb interactions is listed in the figure. (c) Simulated RIXS spectra with varying spin exchange field J ex . The spectra in [4.0 eV, 4.4 eV] energy loss window are magnified by a factor 10 to show the shift of satellite feature S. The magnitude of J ex is listed in the figure. The inverted triangles mark the peak position and are guides for eyes. (d) Simulated RIXS spectra with varying spin-orbit coupling (SOC). The spectra in [4.0 eV, 4.4 eV] energy loss window are magnified by a factor 10. The percentage of reduction in SOC is listed in the figure. Spectra in panels (a,c and d) are shifted vertically for clarity.