NMR study of the spin polarization in dilute Cu based magnetic alloys

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Abstract
63Cu NMR linewidth measurements have been performed on dilute CuMn, CuFe and CuCr alloys, from 0.34 to 150 K and between 1 and 50 kG. The data have been compared with magnetization measurements and it has been shown that the existence of interactions between impurities is reflected by the NMR results even for very dilute CuMn and CuFe samples ++++(a few tens of ppm). From the single impurity contributions to the NMR width, the sd effective exchange interactions have been deduced and are found to scale as expected from the Kondo temperatures. The amplitude of the asymptotic spin polarization as deduced from the present results have been compared with its values near the impurity given by the satellite Knight shift data of Boyce and Slichter (1974) in CuFe. It is shown that the observed slight deviations with respect to the RKY asymptotic limit can be explained with results deduced from the Hartree-Fock magnetic limit of the Anderson model.