Measurements of electron-spin density near Co atoms in Cu

We report nuclear-magnetic-resonance studies of Cu Co in which we resolve and identify satellites due to three shells of Cu near neighbors around isolated Co impurities. The satellite positions show that the spatial form of the spin polarization oscillates with distance and that the conduction electrons on these atoms contribute about ---8% of the total impurity susceptibility. The splittings are measured from 1.5 to 450^∘{}K and from 6.4 to 63 kG and compared with the susceptibility χ of singles. The width of the main line is decomposed into contributions Δ₁ and Δ₂ from isolated Co atoms and pairs of Co atoms, respectively, by use of the temperature variation of the splitting and of the pair susceptibility χ₂. the theory of Walstedt and Walker is used to show that Δ₁ agrees with what one would expect from the satellite splittings, and that Δ₁Δ₂ is reasonable in terms of the magnitude and temperature dependence of χ₁ and χ₂. The results are scaled to CuFe to show that much of the observed linewidth anomaly is of the same origin, and must be included before possible conclusions can be made about Kondo correlation effects.