Emerging frustration effects in ferromagnetic Ce2[Pd1-xAgx]2In alloys
Abstract
Magnetic and thermal properties of Ferromagnetic (FM) Ce2.15(Pd1-xAgx)1.95In0.9 alloys were studied in order to determine the Quantum Critical Point (QCP) at TC => 0. The increase of band electrons produced by Pd/Ag substitution depresses TC(x) from 4.1K down to TC(x=0.5)=1.1K, with a QCP extrapolated to xQCP~ 0.6. Magnetic susceptibility from T>30K indicates an effective moment slightly decreasing from μeff=2.56μB to 2.4μB at x=0.5. These values and the paramagnetic temperature θP~ -10K exclude significant Kondo screening effects. The TC(x) reduction is accompanied by a weakening of the FM magnetization and the emergence of a specific heat Cm(T) anomaly at T*~ 1K, without signs of magnetism detected from AC-susceptibility. The magnetic entropy collected around 4K (i.e. the TC of the x=0 sample) practically does not change with Ag concentration: Sm(4K)~ 0.8 Rln2, suggesting a progressive transfer of FM degrees of freedom to the non-magnetic (NM) component. No antecedent was found concerning any NM anomaly emerging from a FM system at such temperature. The origin of this anomaly is attributed to an 'entropy bottleneck' originated in the nearly divergent power law dependence for T>T*.
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