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We present measurements of the temperature and field dependencies of themagnetization M(T,H) of Nd(O0.89F0.11)FeAs at fields up to 33T, which show thatsuperconductivity with the critical temperature Tc ~ 51K cannot coexist withantiferromagnetic ordering. Although M(T,H) at 55 < T < 140K exhibits a clearCurie-Weiss temperature dependence corresponding to the Neel temperature TN ~11-12K, the behavior of M(T,H) below Tc is only consistent with eitherparamagnetism of weakly interacting magnetic moments or a spin glass state. Wesuggest that the anomalous magnetic behavior of an unusual high-fieldparamagnetic superconductor Nd(O1-xFx)FeAs is mostly determined by the magneticNd ions.

Can antiferromagnetism and superconductivity coexist in the high-field paramagnetic superconductor Nd(O,F)FeAs?