How chemical pressure affects the fundamental properties of rare-earth pnictides: an ARPES view

Abstract

Angle-resolved photoelectron spectroscopy, supplemented by theoretical calculations has been applied to study the electronic structure of heavy-fermion material CeFePO, a homologue to the Fe-based high-temperature superconductors, and CeFeAs_0.7P_0.3O, where the applied chemical pressure results in a ferromagnetic order of the 4f moments. A comparative analysis reveals characteristic differences in the Fe-derived band structure for these materials, implying a rather different hybridization of valence electrons to the localized 4f orbitals. In particular, our results suggest that the ferromagnetism of Ce moments in CeFeAs_0.7P_0.3O is mediated mainly by Fe 3d_xz/yz orbitals, while the Kondo screening in CeFePO is instead due to a strong interaction of Fe 3d_3z^2-r^2 orbitals.

arXiv comment5 pages, 3 figures, accepted for publication in Phys. Rev. B (Rapid)

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Cited by in corpus (2)

• Suppression of the magnetic order in CeFeAsO: non-equivalence of hydrostatic and chemical pressure
• Temperature and doping dependence of normal state spectral properties in a two-orbital model for ferropnictides