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Abstract:
The temperature dependences of the resistivity, the magnetic
susceptibility, and the thermoelectric power were studied in CeSi 2-xGa
x Kondo lattices (0les xles1.3) having the alpha-ThSi 2 structure.
Measurements were made at 1.7< T<300 K. It was found that, as the
gallium content x increases, a transition from a high to a low Kondo
temperature TK occurs at xap0.2-0.3. This is an analog of the
alpha-gamma transition in metallic cerium. It was also found that when
0.1les xles1.3 the CeSi 2-xGa x alloys pass from the paramagnetic to the
ferromagnetic state at a temperature TMlsim12 K. This temperature is
almost independent of x near the phase transition; for 0.7lsim xles1.3,
it falls from 12 K at x=0.7 to 5 K at x=1.3, probably indicating a
decreased electron density when silicon is replaced by gallium in CeSi
2-xGa x.
