COMPETITION BETWEEN RKKY AND KONDO INTERACTIONS IN CESI2-XGAX

Electrical resistivity measurements on compounds belonging to CeSi2-xG ax (0.7 less than or equal to x less than or equal to 1.3) have been p erformed. The samples in this concentration range show a smooth crosso ver from a RKKY dominated ground state to a state where the single sit e Kondo interactions dominate. The variation of Kondo temperature and the magnetic ordering temperature with Ga concentration agree well wit h the Kondo lattice model. An attempt has also been made to calculate the resistivity curves in these compounds from our quasielastic neutro n line width data and using Freimuth's model modified by Garde and Ray . Our results remove an important deficiency in the tatter model conce rning the motion of the f level relative to the Fermi level.