Abstract:
Magnetoresistance measurements on CeSi(2-x),Ga(x), x = 0.7, 1.0 and 1.3 were carried out in the temperature range 3K-125K and in fields upto 80 kOe. The data gives a dear evidence of competition between Kondo and RKKY interactions as the temperature is lowered in these ferromagnetic Kondo systems. As the Ga concentration is increased the Kondo interaction strengthen at the expense of magnetic interactions which is consistent with Doniach's diagram. This has been interpreted as an electronically driven volume transition as a function of Ga doping.
