MCD study on materials without magnetic order

Core excited magnetic circular dichroism (AICD) signals have been measured on PrFe4P12 and CePd3 under the status without magnetic order. The inverse values of the MCD magnitudes have been plotted against temperatures to be c ompared with the inverse plots of the bulk susceptibility. It lias been fou nd on PrFe4P12 that the inverse of MCD magnitudes behaves like a material w ith local magnetic moments at high temperature region but behaves as if the local magnetic moments disappear at low temperature region with T-K much h igher than 10 K, while its bulk susceptibility is known to show a "ferromag netic" behavior above 6 K. Those oil CePd3 have been found to behave like a normal dilute Kondo alloy as if T-K, is around 20 K, which contradicts the known TK of 150 K and is in striking contrast to our former result oil CeF e4P12. This result suggests that T-K of a "coherent" Kondo material could b e much higher than TK observed through "local" spin fluctuation due to some antiferromagnetic interaction between neighboring 4f moments.