Fig. 4: Onset of coherence in CePd3 as observed by resonant inelastic X-ray scattering (RIXS).
From: Kondo quasiparticle dynamics observed by resonant inelastic x-ray scattering
a Detailed thermal variation of RIXS spectra between 22 K and 300 K. For clarity, the elastic lines have been subtracted from the data. The emergence of the coherent state at Tcoh appears as a transfer of intensity between distinct excitations. We phenomenologically model this by Lorentzian fits of the data, as indicated in the left (22 K) and right (300 K) panels. Colored markers in the center panel indicate the centroids of these features. As the J = 5/2 quasiparticles become thermally populated, an anti-Stokes peak (green) appears on the photon-energy-gain side. The black lines show the thermal evolution of the J = 5/2 and J = 7/2 peaks in our NCA/AIM calculation of χ″ (see text for details). b Comparison of temperature-dependent RIXS (top) with the exact AIM-RIXS calculation (bottom). This model accurately captures the parallel shift of J = 5/2 and J = 7/2 features. The overestimation of the SO gap is an artifact of the necessary discretization (see text for details).
