Magnetic behavior of Ce2-xLaxCoSi3 and Ce2Co1-yNiySi3 alloys

The influence of lattice expansion caused by the substitution of Ni for Co and La for Ce on the electrical resistivity, heat-capacity and magnetic sus ceptibility behavior (above 1.5 K) of the new mixed-valent compound, Ce2CoS i3, are investigated by studying the ternary series Ce2-x.LaxCoSi3 and Ce2C o1-yNiySi3. On the basis of data, it is inferred that the electronic struct ure variations play a dominant role as compared to the chemical pressure ef fects in determining the strength of the Kondo effect in these alloys. Some of the alloys in these solid solutions may provide an opportunity to under stand non-Fermi-liquid phenomena. (C) 2000 Elsevier Science B.V. All rights reserved.