Long- to short-range magnetic order in fluorine-doped CeFeAsO

Details Long- to short-range magnetic order in fluorine-doped CeFeAsO Long- to short-range magnetic order in fluorine-doped CeFeAsO

2011-09-14

arxiv.org/abs/1109.3170v1

Physics

Condensed Matter

Superconductivity

Scientific paper

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/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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