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.

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

References in corpus (12)

• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
• Bandwidth and Fermi surface of Iron-Oxypnictides: covalency and sensitivity to structural changes
• Interplay of Rare Earth and Iron magnetism in RFeAsO with R = La, Ce, Pr, and Sm: A muon spin relaxation study and symmetry analysis
• CeFePO: A Heavy Fermion Metal with Ferromagnetic Correlations
• The crystalline electric field as a probe for long range antiferromagnetic order and superconductivity in CeFeAsO${}_{1-x}$F${}_x$
• Local moment versus Kondo behavior of the 4f-electrons in rare-earth iron oxypnictides
• Rare earth magnetism in CeFeAsO: A single crystal study
• Excitation energy map of the high-energy dispersion anomalies in cuprates
• Ferromagnetism and superconductivity in P-doped CeFeAsO
• Search for pressure induced superconductivity in CeFeAsO and CeFePO iron pnictides
• CeFePO: f-d hybridization and quenching of superconductivity