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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Cited by in corpus (4)

• Common effect of chemical and external pressures on the magnetic properties of RECoPO (RE = La, Pr)
• Avoided ferromagnetic quantum critical point in CeRuPO
• Hydrostatic and chemical pressure tuning of CeFeAs_1-xP_xO single crystals
• How chemical pressure affects the fundamental properties of rare-earth pnictides: an ARPES view