Electronic structure of semiconducting CeFe₄P₁₂: Strong hybridization and relevance of single-impurity Anderson model

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Semiconducting skutterudite CeFe₄P₁₂ is investigated by synchrotron x-ray photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). Ce 3d core-level PES and 3d-4f XAS, in combination with single impurity Anderson model (SIAM) calculations, confirm features due to f⁰, f¹ and f² configurations. The Ce 4f density of states (DOS) indicates absence of a Kondo resonance at Fermi level, but can still be explained by SIAM with a small gap in non-f DOS. While Ce 4f partial DOS from band structure calculations are also consistent with the main Ce 4f DOS, the importance of SIAM for core and valence spectra indicates Kondo semiconducting mixed valence for CeFe₄P₁₂, derived from strong hybridization between non-f conduction and Ce 4f DOS.