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A detailed $^{31}$P (I=1/2) and $^{75}$As (I=3/2) NMR study onpolycrystalline CeFeAs$_{1-x}$P$_{x}$O alloys is presented. The magnetism ofCeFeAsO changes drastically upon P substitution on the As site. CeFePO is aheavy fermion system without long range order whereas CeFeAsO exhibits aFe-3$d$ SDW type of ordering accompanied by a structural transition fromtetragonal ($TT$) to orthorhombic ($OT$) structure. Furthermore Ce-4$f^{1}$orders antiferromagnetically (AFM) at low temperature. At the criticalconcentration where the Fe-magnetism is diminished the Ce-Ce interactionchanges to a ferromagnetic (FM) type of ordering. Three representative samplesof the CeFeAs$_{1-x}$P$_{x}$O ($x$=0.05, 0.3 and 0.9) series are systematicallyinvestigated. 1) For the $x$=0.05 alloy a drastic change of the line width at130 K indicates the AFM-SDW type of ordering of Fe and the structural changefrom $TT$ to $OT$ phase. The line width roughly measures the internal field inthe ordered state and the transition is most likely first order. The small andnearly constant shift for $^{31}$P and $^{75}$As suggests the presence ofcompeting hyperfine interactions between the nuclear spins and the 4$f$ and3$d$ ions of Ce and Fe. 2) For the $x$=0.3 alloy, evolution of the Fe-SDW typeorder takes place at around 70 K corroborating the results of bulk measurementand $\mu SR$. Here we found strong evidence for phase separation ofparamagnetic and magnetic SDW phases. 3) In contrast to heavy fermion CeFePOfor the $x$=0.9 alloy a phase transition is found at 2 K. The field-dependentNMR shift gives strong evidence of FM ordering. Above the ordering the spinlattice relaxation rate $^{31}$(1/T$_{1}$) shows unconventional, non-Korringalike behaviour which indicates a complex interplay of Kondo and FMfluctuations.

Interplay between Fe 3d and Ce 4f magnetism and Kondo interaction in CeFeAs_{1-x}P_{x}O probed by ^{75}As and ^{31}P NMR