63Cu NMR satellite studies of the electron spin polarization and impurity susceptibility in Cu-Fe

Abstract

NMR measurements on both bulk and near neighbour nuclei of the impurity have been performed in dilute Ce‐Fe alloys (c ranging from 20 to 4000 ppm) in external fields of about 60 and 30 kGauss. Interaction between impurities broaden the satellite resonances, but their differential NMR shift ΔK, all have the same temperature dependence, showing the absence of any change of the spatial dependence of the spin polarization from T≪TK to T≫TK. The data for ΔK(T) scale with the Mossbauër hyperfine field (≡Knight shift) data on 57Fe, if a value Korb= (5+0.5) % is taken for the orbital contribution to K(57Fe). These results confirm that the impurity susceptibility has a [1−(T/17)2] temperature dependence below TK. The spin polarization and the T dependence of the local susceptibility χ (T) are discussed in terms of recent theoretical calculations for both the sd and Anderson model.