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Peculiar Thermal Features of Ce-Systems Around Their Critical Points

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Some non-predicted thermal behavior observed in various Ce-lattice compounds close to their critical points are presented. From a comparison between phase diagrams driven by doping (x) and pressure, a pre-critical region (x* < x < xcr) is identified in the former group. Some systematic behaviors, observed in the specific heat (Cm/T) and the entropy gain, are recognized as characteristic features of that region. Different measured temperature dependencies of Cm/T are compared, detecting that the onset of the non-Fermi-liquid behavior occurs much closer to x* than xcr. In a detailed analysis of the evolution of the thermal dependence within the pre-critical region, a further change in the T dependence is frequently observed before to reach the critical point. A generalized power law function is proposed to compare different systems, which allows to identify a low temperature Cm/T(T) anomaly that only involves about 0.01 × R ln 2 of entropy.

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Sereni, J.G. Peculiar Thermal Features of Ce-Systems Around Their Critical Points. J Low Temp Phys 147, 179–197 (2007). https://doi.org/10.1007/s10909-007-9313-1

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