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We report on the recovery of the short-range static magnetic order and on theconcomitant degradation of the superconducting state in optimally F-dopedSmFe_(1-x)Ru_(x)AsO_0.85F_0.15 for 0.1< x<0.6. The two reduced order parameterscoexist within nanometer-size domains in the FeAs layers and finally disappeararound a common critical threshold x_c=0.6. Superconductivity and magnetism areshown to be closely related to two distinct well-defined local electronicenvironments of the FeAs layers. The two transition temperatures, controlled bythe isoelectronic and diamagnetic Ru substitution, scale with the volumefraction of the corresponding environments. This fact indicates thatsuperconductivity is assisted by magnetic fluctuations, which are frozenwhenever a short-range static order appears, and totally vanish above themagnetic dilution threshold x_c.

Correlated trends of coexisting magnetism and superconductivity in optimally electron-doped oxy-pnictides