Conduction-Electron Spin Density around Fe Impurities in Cu above and belowTK

Abstract

We have observed the nuclear resonances of five shells of Cu atoms which are near neighbors to single Fe atoms in dilute alloys of $\mathrm{Cu}\mathrm{Fe}$, following four shells from 300 K to well below the Kondo temperature, 29 K. The spin density has the same temperature dependence as the magnetic susceptibility, showing that contrary to some speculation there is no drastic change in the spatial polarization associated with the "Kondo condensation."