Probing the gamma-alpha Transition in Bulk Ce under Pressure: A Direct   Investigation by Resonant Inelastic X-ray Scattering
  We report on the most complete investigation to date of the 4f-electron properties at the gamma-alpha transition in elemental Ce by resonant inelastic x-ray scattering (RIXS). The Ce 2p3d-RIXS spectra were measured directly in the bulk material as a function of pressure through the transition. The spectra were simulated within the Anderson impurity model. The occupation number nf was derived from the calculations in both gamma- and alpha-phases in the ground state along with the f doubleoccupancy. We find that the electronic structure changes result mainly from band formation of 4f electrons which concurs with reduced electron correlation and increased Kondo screening at high pressure. 
Jean-Pascal Rueff (CPMR, Ssoleil), Jean-Paul Iti\'e (SSOLEIL), M.   Taguchi (SXSL), C. F. Hague (CPMR), J.-M. Mariot (CPMR),...