PUMA
Istituto dei materiali per l'elettronica ed il magnetismo     
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. Long- to short-range magnetic order in fluorine-doped CeFeAsO. In: Physical Review B, vol. 84 (19) article n. 195123. AIP, 2011.
 
 
Abstract
(English)
The evolution of the antiferromagnetic order parameter in CeFeAsO1−xFx 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.
URL: http://link.aps.org/doi/10.1103/PhysRevB.84.195123
DOI: 10.1103/PhysRevB.84.195123
Subject iron based superconductor
mSR
magnetic ordering
74.25.Dw
74.25.Ha
76.75.+i


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