J. Phys. Soc. Jpn. 67, pp. 1767-1775 (1998) [9 Pages]
FULL PAPERS

Comparative Study of Magnetic Phase Diagrams of Ce Compounds

+ Affiliations
1División Bajas Temperaturas, Centro Atómico Bariloche-CNEA, cc 439, 8400 S.C. de Bariloche, Argentina

Thermal properties of magnetically ordered C e -lattice systems are compared in their crossover to the non-magnetic state, driven by alloying effects. The ordering temperature ( T ord = T N or T C ) is found to go to zero continuously only in a few cases, while in others a discontinuity in its decrease is clearly observed. Coincidentally, the magnetic contribution to the specific heat ( C p ), the entropy and the free energy variations with temperature mark an evident difference between those cases. Furthermore, the extension of the non-Fermi-liquid (NFL) phase in terms of concentration variation correlates with differences observed in the respective ordered phase. A systematic transformation from a mean field like transition to a fluctuation dominated type is observed in C p ( T ), as the system overcomes a characteristic crossover concentration. Such a concentration appears as a limit for the NFL behavior in the paramagnetic phase above T ord . A possible origin of the mentioned differences are discussed in terms of some alternatives in the evolution of the magnetic moments and the strength of their interactions.

©1998 The Physical Society of Japan

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