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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

physical review b

Site dependence of the Kondo scale in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CePd</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Rh</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>due to Pd-Rh disorder

Site dependence of the Kondo scale inCePd1−xRhxdue to Pd-Rh disorder