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An investigation of the structural, thermodynamic, and electronic transportproperties of the isoelectronic chemical substitution seriesCe(Pd$_{1-x}$Ni$_x$)$_2$P$_2$ is reported, where a possible ferromagneticquantum critical point is uncovered in the temperature - concentration ($T-x$)phase diagram. This behavior results from the simultaneous contraction of theunit cell volume, which tunes the relative strengths of the Kondo and RKKYinteractions, and the introduction of disorder through alloying. Near thecritical region at $x_{\rm{cr}}$ $\approx$ 0.7, the rate of contraction of theunit cell volume strengthens, indicating that the cerium $f$-valence crossesover from trivalent to a non-integer value. Consistent with this picture, x-rayabsorption spectroscopy measurements reveal that while CePd$_2$P$_2$ has apurely trivalent cerium $f$-state, CeNi$_2$P$_2$ has a small ($<$ 10 \%)tetravalent contribution. In a broad region around $x_{\rm{cr}}$, there is abreakdown of Fermi liquid temperature dependences, signaling the influence ofquantum critical fluctuations and disorder effects. Measurements of cleanCePd$_2$P$_2$ furthermore show that applied pressure has a similar initialeffect to alloying on the ferromagnetic order. From these results,CePd$_2$P$_2$ emerges as a keystone system to test theories such as theBelitz-Kirkpatrick-Vojta model for ferromagnetic quantum criticality, wheredistinct behaviors are expected in the dirty and clean limits.

Ferromagnetic Quantum Critical Point in CePd$_2$P$_2$ with Pd $\rightarrow$ Ni Substitution