Thermodynamical Analysis of the Magnetic Phase Diagrams of Ce Systems

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¹Divisiòn Bajas Temperaturas, Centro Atómico Bariloche, Comisiòn Nacional de Energia Atòmica, cc 439, 8400 San Carlos de Bariloche, Argentina

Received January 11, 2001

Three types of magnetic phase diagrams as a function of composition or pressure, f ( z , p ), are identified among Ce systems: I) with the ordering temperature T _ord→0 monotonously, followed by a narrow region where non-Fermi-liquid (NFL) behavior is observed; II) with T _ord vanishing at finite temperature, but followed by an extended NFL region, and III) where T _ord remains nearly constant. Among the analyzed systems intrinsic differences are found in the evolution of their respective properties, namely: in group-I an increase of the density of excitations is observed below T _ord. In group-II the evanescense of T _ord( z , p ) coincides with the extrapolation to zero of the magnetic free energy (Δ G →0), and the existence of a reference function implying that T _K≠ f ( z , p ), whereas T _ord= f ( z , p ). Finally, group-III is also characterized by the evanescense of T _ord where Δ G →0, but in this case T _ord≠ f ( z , p ) whereas T _K= f ( z , p ). The characteristics of each group are discussed and compared together with the different C _p( T )/ T dependencies at T ≥ T _ord and some related scalings, which allow to recognize a quasi-paramagnetic phase.

https://doi.org/10.1143/JPSJ.70.2139

KEYWORDS: cerium compounds, magnetic phase diagrams, non Fermi liquid, specific heat, entropy, free energy

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Thermodynamical Analysis of the Magnetic Phase Diagrams of Ce Systems

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