SYSTEMATICS ON THE CERIUM MAGNETIC-TRANSFORMATIONS INDUCED BY ALLOYING

A systematic study on the competition between on-site and inter-site m agnetic interactions is performed on Ce intermetallics through magneti c, thermal, transport, structural and spectroscopic measurements analy ses. It is shown that the volume and the electronic concentration vari ation produced by alloying the Ce-ligand, are not equivalent and only the volume reduction. produces the maximum in the ordering temperature predicted by theory. For the magnetic to intermediate valence transfo rmations, a change of regime is observed at a critical Ce-ligand subst itution, which corresponds to a change in the substitution dependence of the experimental parameters. On the contrary, no change of regime i s detected for the magnetic to heavy fermion transformation. The diffe rent regimes are correlated with the respective hybridization strength s of the ground and excited crystalline field states through the tempe rature dependence of the electrical resistivity. Such a correlation al lows us to draw a generalized phase diagram containing these types of transformation.