Ferromagnetism and superconductivity in P-doped CeFeAsO

Abstract

We report on superconductivity in CeFeAs1-xPxO and the possible coexistence with Ce- ferromagnetism (FM) in a small homogeneity range around x = 30% with ordering temperatures of T_SC = T_C = 4K. The antiferromagnetic (AFM) ordering temperature of Fe at this critical concentration is suppressed to T^N_Fe ~ 40K and does not shift to lower temperatures with further increase of the P concentration. Therefore, a quantum-critical-point scenario with T^N_Fe -> 0K which is widely discussed for the iron based superconductors can be excluded for this alloy series. Surprisingly, thermal expansion and X-ray powder diffraction indicate the absence of an orthorhombic distortion despite clear evidence for short range AFM Fe-ordering from muon-spin-rotation measurements. Furthermore, we discovered the formation of a sharp electron spin resonance signal unambiguously connected with the emergence of FM ordering.

5 pages, 4 figures, published in Phys. Rev. B (Rapid Communication, Editors suggestion)

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• Avoided ferromagnetic quantum critical point: Unusual short-range ordered state in CeFePO
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• Avoided ferromagnetic quantum critical point in CeRuPO
• Kondo-lattice ferromagnets and their peculiar order along the magnetically hard axis
• Coexistence of ferromagnetism and superconductivity in CeO${}_{0.3}$F${}_{0.7}$BiS${}_2$
• Charge doping versus disorder in CeFeAsO: do the in- and out-of-plane dilutions play the same role?
• Specific Heat Anomalies in Solids Described by a Multilevel Model
• A view from inside iron-based superconductors
• Tunable interplay between 3d and 4f electrons in Co-doped iron pnictides
• Probing the Mott Physics in $\kappa$-(BEDT-TTF)${}_2$X Salts via Thermal Expansion
• High-Pressure Phase Diagram of NdFeAsO${}_{0.9}$F${}_{0.1}$: Disappearance of superconductivity on the verge of ferromagnetism from nd moments
• Emergence of superconductivity in single-crystalline LaFeAsO under simultaneous Sm and P substitution
• Origin of the non-Fermi-liquid behavior in CeRh2As2
• Ferromagnetic ordering of linearly coordinated Co ions in LiSr${}_2$[CoN${}_2$]
• Hydrostatic and chemical pressure tuning of CeFeAs_1-xP_xO single crystals
• Avoided ferromagnetic quantum critical point: Antiferromagnetic ground state in substituted CeFePO
• Electron doping of the iron-arsenide superconductor CeFeAsO controlled by hydrostatic pressure
• Suppression of the magnetic order in CeFeAsO: non-equivalence of hydrostatic and chemical pressure
• How chemical pressure affects the fundamental properties of rare-earth pnictides: an ARPES view
• Importance of anisotropic interactions for hard-axis/plane ordering of Ce-based ferromagnets
• Magnetocrystalline anisotropic effect in GdCo${}_{1-x}$Fe${}_x$AsO ($x=0,0.05$)