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Magnetic and thermal properties of Ferromagnetic (FM)Ce_{2.15}(Pd_{1-x}Ag_x)_{1.95}In_{0.9} alloys were studied in order todetermine the Quantum Critical Point (QCP) at T_C => 0. The increase of bandelectrons produced by Pd/Ag substitution depresses T_C(x) from 4.1K down toT_C(x=0.5)=1.1K, with a QCP extrapolated to x_{QCP}~ 0.6. Magneticsusceptibility from T>30K indicates an effective moment slightly decreasingfrom \mu_{eff}=2.56\mu_B to 2.4\mu_B at x=0.5. These values and theparamagnetic temperature \theta_P~ -10K exclude significant Kondo screeningeffects. The T_C(x) reduction is accompanied by a weakening of the FMmagnetization and the emergence of a specific heat C_m(T) anomaly at T*~ 1K,without signs of magnetism detected from AC-susceptibility. The magneticentropy collected around 4K (i.e. the T_C of the x=0 sample) practically doesnot change with Ag concentration: S_m(4K)~ 0.8 Rln2, suggesting a progressivetransfer of FM degrees of freedom to the non-magnetic (NM) component. Noantecedent was found concerning any NM anomaly emerging from a FM system atsuch temperature. The origin of this anomaly is attributed to an 'entropybottleneck' originated in the nearly divergent power law dependence for T>T*.

Emerging frustration effects in ferromagnetic Ce_2[Pd_{1-x}Ag_x]_2In alloys