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The appearance of static magnetism, nanoscopically coexisting withsuperconductivity, is shown to be a general feature of optimally electron-dopedLnFe(1-x)Ru(x)AsO(1-y)F(y) superconductor (Ln - lanthanide ion) upon isovalentsubstitution of Fe by Ru. The magnetic ordering temperature T_N and themagnitude of the internal field display a dome-like dependence on x, peakedaround x=1/4, with higher T_N values for those materials characterized by alarger z cell coordinate of As. Remarkably, the latter are also those with thehighest superconducting transition temperature (T_c) for x=0. The reduction ofT_c(x) is found to be significant in the x region of the phase diagram wherethe static magnetism develops. Upon increasing the Ru content superconductivityeventually disappears, but only at x=0.6.

The onset of magnetism peaked around x=1/4 in optimally electron-doped LnFe(1-x)Ru(x)AsO(1-y)F(y) (Ln = La, Nd or Sm) superconductors