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The recent observation of superconductivity with critical temperatures up to55 K in the FeAs based pnictide compounds marks the first discovery of a noncopper-oxide based layered high-Tc superconductor (HTSC) [1-3]. It has raisedthe suspicion that these new materials share a similar pairing mechanism to thecuprates, since both exhibit superconductivity following charge doping of amagnetic parent material. Here we present a muon spin rotation study onSmFeAsO1-xFx (x=0-0.30), which shows that static magnetism persists well intothe superconducting regime. The analogy with the cuprates is quite surprisingsince the parent compounds appear to have different magnetic ground states:itinerant spin density wave for the pnictides contrasted with the Mott-Hubbardinsulator in the cuprates. Our findings suggest that proximity to magneticorder and associated soft magnetic fluctuations, rather than the strongelectronic correlations in the vicinity of a Mott-Hubbard-metal-to-insulatortransition, may be the key ingredients of HTSC.

Coexistence of static magnetism and superconductivity in SmFeAsO1-xFx as revealed by muon spin rotation