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We provide direct experimental evidence for the identical effect of thein-plane Fe$_{1-x}$Co$_{x}$ and of the out-of-plane O$_{1-x}$F$_{x}$ chemicaldilutions on the itinerant spin-density-wave (SDW) magnetic phase in CeFeAsO.Remarkably, the suppression of SDW is not sensitive at all to the differentkinds of disorder introduced in the two cases. Still, it is clearly shown thatthe sizeable in-plane disorder induced by the Fe$_{1-x}$Co$_{x}$ substitutionis highly effective in suppressing $T_{\textrm{c}}$. Differently from what isobserved in CeFeAsO$_{1-x}$F$_{x}$, the ordered magnetic phase of the Cesublattice is preserved throughout the whole phase diagram inCeFe$_{1-x}$Co$_{x}$AsO ($x \leq 0.2$). An intriguing effect is encountered,whereby the magnetic coupling among Ce$^{3+}$ ions is enhanced by thesuperconducting phase.

Charge doping versus disorder in CeFeAsO: do the in- and out-of-plane dilutions play the same role?