  We have performed 31P-NMR measurements of the c-axis-aligned poly-crystal
Ce(Ru1-xFex)PO with a two-dimensional layered structure in order to understand
the origin of TCurie suppression by Fe substitution. The variation in the
magnetic-fluctuation character with respect to x is investigated from the
in-plane and out-of plane fluctuations and the relationship between the static
spin susceptibility and the in-plane fluctuation. It was found that
three-dimensional ferromagnetic (FM) correlations are dominant and give rise to
the FM ordering in CeRuPO. The out-of-plane fluctuations are significantly
suppressed with increasing x, and it was revealed that the FM fluctuations
become two dimensional near a FM quantum critical point (QCP). Our NMR results
strongly suggest that a unique FM QCP in Ce(Ru1-xFex)PO is induced by the
suppression of the magnetic correlations along the c-axis, which is a different
mechanism from that presumed in heavy-fermion compounds.
