Electronic structure of semiconducting CeFe${}_4$P${}_{12}$: Strong hybridization and relevance of single-impurity Anderson model

Abstract

Semiconducting skutterudite CeFe${}_4$P${}_{12}$ is investigated by synchrotron x-ray photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). Ce 3$d$ core-level PES and 3$d-4f$ XAS, in combination with single impurity Anderson model (SIAM) calculations, confirm features due to $f^0$, $f^1$ and $f^2$ configurations. The Ce 4$f$ 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 4$f$ partial DOS from band structure calculations are also consistent with the main Ce 4$f$ DOS, the importance of SIAM for core and valence spectra indicates Kondo semiconducting mixed valence for CeFe${}_4$P${}_{12}$, derived from strong hybridization between non-$f$ conduction and Ce 4$f$ DOS.

4pages, 4figures

References in corpus (7)

• Unusual behaviors in the transport properties of REFe${}_4$P${}_{12}$ (RE: La, Ce, Pr, and Nd)
• Exotic Heavy Fermion State in the Filled Skutterudite PrFe${}_4$P${}_{12}$ Uncovered by the de Haas-van Alphen Effect
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• XANES study of rare-earth valency in LRu4P12 (L = Ce and Pr)
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• Localized Character of 4f Electrons in CeRh${}_x$(x=2,3) and CeNi${}_x$(x=2,5)
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Cited by in corpus (3)

• Collapse of the $G{d}^{3+}$ ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor $CeF{e}_4{P}_{12}$
• Phonon Scattering Mechanism in Thermoelectric Materials Revised via Resonant X-ray Dynamical Diffraction
• Crystalline electric field effects in Ce 3$d$ core-level spectra of heavy-fermion systems: Hard X-ray photoemission spectroscopy on CeNi${}_{1-x}$Co${}_x$Ge${}_2$