CeFePO: A Heavy Fermion Metal with Ferromagnetic Correlations

Abstract

The ground state properties of CeFePO, a homologue of the new high temperature superconductors RFePnO(1-x)Fx, were studied by means of susceptibility, specific heat, resistivity, and NMR measurements on polycrystals. All the results demonstrate that this compound is a magnetically non-ordered heavy Fermion metal with a Kondo temperature TK~10K, a Sommerfeld coefficient gamma=700mJ/molK2 and a mass enhancement factor of the order of 200. The absence of a Fe-contribution to the effective moment at high temperatures indicates that the magnetism in CeFePO is completely dominated by the effect of Ce. Thus the strong electronic correlation effects originate from the Ce-4f electrons rather than from the Fe-3d electrons. An enhanced Sommerfeld-Wilson ratio R=5.5 as well as a Korringa product S0/T1TK2~0.065 well below 1 indicate the presence of ferromagnetic correlations. Therefore, CeFePO appears to be on the non-magnetic side of a ferromagnetic instability.

5 pages, 4 figures

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• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
• Evolution from Itinerant Antiferromagnet to Unconventional Superconductor with Fluorine Doping in La(O_{1-x}F_{x})FeAs Revealed by ^{75}As and ^{139}La Nuclear Magnetic Resonance
• ${}^{75}$As NMR studies of superconducting LaO${}_{0.9}$F${}_{0.1}$FeAs
• CeRuPO: A rare example of a Ferromagnetic Kondo lattice
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• Relevance of ferromagnetic correlations for the Electron Spin Resonance in Kondo lattice systems
• Quasiparticle spin susceptibility in heavy-fermion superconductors : An NMR study compared with specific heat results
• Single crystal growth and anisotropy of CeRuPO

Cited by in corpus (56)

• Metallic Quantum Ferromagnets
• Iron pnictides as a new setting for quantum criticality
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• Intrinsic Properties of Stoichiometric LaOFeP
• Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO
• Evidence for Strong Itinerant Spin Fluctuations in the Normal State of CeFeAsO(0.89)F(0.11) Iron-Oxypnictides
• Quantum criticality in the iron pnictides and chalcogenides
• Lattice distortion and magnetic quantum phase transition in CeFeAs(1-x)P(x)O
• Phase diagram of CeFeAs${}_{1-x}$P${}_x$O obtained from electric resistivity, magnetization, and specific heat measurements
• d- and f-orbital correlations in the REFeAsO compounds
• Magnetic ordering and dense Kondo behaviour in EuFe${}_2$P${}_2$
• Local moment versus Kondo behavior of the 4f-electrons in rare-earth iron oxypnictides
• Magnetic impurity resonance states and symmetry of the superconducting order parameter in iron-based superconductors
• Heavy Fermion Quantum Criticality and Destruction of the Kondo Effect in a Nickel Oxypnictide
• Rare earth magnetism in CeFeAsO: A single crystal study
• Avoided ferromagnetic quantum critical point: Unusual short-range ordered state in CeFePO
• Coexistence of superconductivity and ferromagnetism in Sr0.5Ce0.5FBiS2
• Local moments and symmetry breaking in metallic PrMnSbO
• Superconductivity in LnFePO (Ln = La, Pr, and Nd) single crystals
• Common effect of chemical and external pressures on the magnetic properties of RECoPO (RE = La, Pr)
• Metamagnetic Behavior and Kondo Breakdown in Heavy-Fermion CeFePO
• Search for pressure induced superconductivity in CeFeAsO and CeFePO iron pnictides
• Coupling between 4f and itinerant electrons in SmFeAsO1-xFx (0.15 < x < 0.2) superconductors: an NMR study
• A Magnetic Transition Probed by the Ce Ion in Square-Lattice Antiferromagnet CeMnAsO
• Ferromagnetic Quantum Critical Point in Heavy-Fermion Iron Oxypnictide Ce(Ru${}_{1-x}$Fe${}_x$)PO
• Interplay between 3d and 4f magnetism in CeCoPO
• Time-reversal symmetry breaking state near the surface of $s_{\pm }$-superconductor
• Evidence for Competition between Superconductivity and Kondo Effect in CeFeAsO0.7F0.3 under High Pressure
• CeNiAsO: an antiferromagnetic dense Kondo lattice
• Interplay between Co-3d and Ce-4f magnetism in CeCoAsO
• CeFePO: f-d hybridization and quenching of superconductivity
• Strongly correlated multi-impurity models: The crossover from a single-impurity problem to lattice models
• Contiguous 3d and 4f magnetism: towards strongly correlated 3d electrons in YbFe2Al10
• Magnetism of the Fe${}^{2+}$ and Ce${}^{3+}$ sublattices in Ce${}_2$O${}_2$FeSe${}_2$: a combined neutron powder diffraction, inelastic neutron scattering and density functional study
• Tunable interplay between 3d and 4f electrons in Co-doped iron pnictides
• Ferromagnetic Quantum Critical Point Induced by Tuning the Magnetic Dimensionality of the Heavy-Fermion Iron Oxypnictide Ce(Ru${}_{1-x}$Fe${}_x$)PO
• ^31P NMR investigations on the ferromagnetic quantum critical system YbNi_4P_2
• Magnetic Excitations and Interactions in the Kitaev Hyperhoneycomb Iridate $\beta$-Li${}_2$IrO${}_3$
• Iron spin-reorientation transition in NdFeAsO
• Synthesis and physical properties of CeRu${}_2$As${}_2$ and CeIr${}_2$As${}_2$
• Thermodynamic evidence of fermionic behavior in the vicinity of one-ninth plateau in a kagome antiferromagnet
• Kondo effect with tunable spin orbit interaction in LaTiO3/CeTiO3/SrTiO3 heterostructure
• Phase separation at the magnetic-superconducting transition in La${}_{0.7}$Y${}_{0.3}$FeAsO${}_{1-x}$F${}_x$
• Avoided ferromagnetic quantum critical point: Antiferromagnetic ground state in substituted CeFePO
• ${}^{75}$As NMR study of the antiferromagnetic Kondo lattice compound CeNiAsO
• Impact of electronic correlations on the superconductivity of high-pressure CeH${}_9$
• Interplay between Fe 3d and Ce 4f magnetism and Kondo interaction in CeFeAs_{1-x}P_{x}O probed by ^{75}As and ^{31}P NMR
• Electron doping of the iron-arsenide superconductor CeFeAsO controlled by hydrostatic pressure
• Paramagnetic Phase of a Heavy-Fermion Compound, CeFePO, Probed by 57Fe Mössbauer Spectroscopy
• Nuclear magnetic resonance investigation of the heavy fermion system Ce${}_2$CoAl${}_7$Ge${}_4$
• Competing magnetic correlations across the ferromagnetic quantum critical point in the Kondo system CeTi${}_{1-x}$V${}_x$Ge${}_3$: ${}^{51}$V NMR as a local probe
• Order parameter sign-reversal near $s_{\pm }$-superconductor surface
• How chemical pressure affects the fundamental properties of rare-earth pnictides: an ARPES view
• Emergent dynamical Kondo coherence and competing magnetic order in a correlated kagome flat-band metal CsCr6Sb6
• Magnetocrystalline anisotropic effect in GdCo${}_{1-x}$Fe${}_x$AsO ($x=0,0.05$)
• Two-orbital model for CeB${}_6$