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The quasicrystal Al-Pd-Mn is a model system for an experimental study of thecompetition between Ruderman-Kittel-Kasuya-Yoshida (RKKY) and Kondointeractions. First, specific of such alloys, only a few Mn atoms carry aneffective spin and their concentration x is tunable over several orders ofmagnitude, even though the Mn amount is almost constant. Second, thecharacteristic energy scales for the interactions lie in the Kelvin range.Hence we could study the magnetization on both side of these energy scales,covering a range of temperatures [0.1-100 K] and magnetic fields (mu_B H/k_B= 0to 5 K) for 22 samples and x varying over 2 decades. Using very general Kondophysics arguments, and thus carrying out the data analysis with no preconceivedmodel, we found a very robust and simple result: The magnetization is a sum ofa pure Kondo (T_K=3.35K) and a pure RKKY contributions, whatever the momentconcentration is and this surprisingly up to the concentration where the RKKYcouplings dominate fully and thus cannot be considered as a perturbation.Comment: 18 pages, 18 figure

Experimental study of the competition between Kondo and RKKY interactions for Mn spins in a model alloy system