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

作者：Shiroka T^*; Lamura G; Sanna S; Prando G; De Renzi R; Tropeano M; Cimberle M R; Martinelli A; Bernini C; Palenzona A; Fittipaldi R; Vecchione A; Carretta P; Siri A S; Ferdeghini C; Putti M

来源：Physical Review B, 2011, 84(19): 195123.

DOI：10.1103/PhysRevB.84.195123

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.

• 出版日期2011-11-23