Susceptibility and Electron-Spin Relaxation of Fe in Cu belowTK: A NMR Study ofCu63Satellites

Abstract

NMR shifts $\Delta K$ and relaxation times $T_1$ of ${}_{}{}^{63}{}_{}{}^{}\mathrm{Cu}$ satellite resonances corresponding to nuclei near impurities in $\mathrm{Cu}\mathrm{Fe}$ dilute alloys have been measured for $H\sim 60 \mathrm{and} 30$ kG and $T<\mathrm{}20\mathrm{}$ K. The $\Delta K\left(T\right)\mathrm{}$ data confirm that the conduction-electron spin polarization scales with the impurity susceptibility and varies as $1-{\left(\frac{T}{17}\right)}^2$ for $T\ll T_{\mathrm{K}}$. A "Korringa" relation $T_{1}T{\left(\Delta K\right)}^2=\mathrm{const}$ is found, in agreement with recent calculations of the dynamic susceptibility.