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Abstract:
We present measurements of the thermopower S(T) on CePd1-xRhx between 2
K and 300 K. For low Rh content, the system behaves as a ferromagnetic
Kondo system with a Curie temperature T-C of about 6 K, a Kondo scale
smaller than T-C, and an overall crystal electric field splitting of 210
K. As the Rh content increases T-C is suppressed, while the average
Kondo scale gets larger. Simultaneously, the presence of different Ce
environments leads to a broad distribution of local Kondo scales ranging
from very small values to above 50 K. As a consequence, large
thermopower values are observed over an extended temperature range.
Close to the critical concentration we find power-law dependencies of
S/T vs T down to 2 K. For a Rh content of x = 0.95 we may show
explicitly that the thermopower contains contributions from Ce sites
with different local energy scales.
