Journal
PHYSICAL REVIEW B
Volume 84, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.195123
Keywords
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Funding
- MIUR [XWLWF9]
- Schweizer Nationalfonds (SNF)
- NCCR
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The evolution of the antiferromagnetic order parameter in CeFeAsO(1-x)F(x) as a function of the fluorine content x was investigated primarily via zero-field muon-spin spectroscopy. The long-range magnetic order observed in the undoped compound gradually turns into a short-range order at x = 0.04, seemingly accompanied or induced by a drastic reduction of the magnetic moment of the iron ions. Superconductivity appears upon a further increase in doping (x > 0.04) when, unlike in the cuprates, the Fe magnetic moments become even weaker. The resulting phase diagram evidences the presence of a crossover region, where the superconducting and the magnetic order parameters coexist on a nanoscopic range.
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