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CeRuPO is a rare example of a ferromagnetic (FM) Kondo-lattice system.External pressure suppresses the ordering temperature to zero at about$p_c\approx3$ GPa. Our ac-susceptibility and electrical-resistivityinvestigations evidence that the type of magnetic ordering changes from FM toantiferromagnetic (AFM) at about $p^*\approx0.87$ GPa. Studies in appliedmagnetic fields suggest that ferromagnetic and antiferromagnetic correlationscompete for the ground state at $p>p^*$, but finally the AFM correlations win.The change in the magnetic ground-state properties is closely related to thepressure evolution of the crystalline-electric-field level (CEF) scheme and themagnetic Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction. TheN\'{e}el temperature disappears abruptly in a first-order-like fashion at$p_c$, hinting at the absence of a quantum critical point. This is consistentwith the low-temperature transport properties exhibiting Landau-Fermi-liquid(LFL) behavior in the whole investigated pressure range up to 7.5 GPa.

Avoided ferromagnetic quantum critical point in CeRuPO