We report on the most complete investigation to date of the -electron properties at the 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 n(f) and f double occupancy were derived from the calculations in both gamma and alpha phases in the ground state. 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.
We have performed angle-and spin-resolved photoemission measurements on Fe 3 O 4 (0 0 1)/MgO(0 0 1). Despite intrinsic electron-lattice (polaron) interaction a Fe t 2g band dispersion is observed, as well as a Fermi surface. The states close to the Fermi level show a spin polarization up to −72% as measured with a 4.65 eV laser light. All the data can be simulated starting from GGA + U bulk band-structure calculations and taking into account the polaron and initial-state lifetime broadening involved in the photoemission process. This conciliates the electronic structure of Fe 3 O 4 with a band model and confirms the half-metallic nature of Fe 3 O 4 .
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