Calculation of the Temperature Dependence of the Knight Shift in Cadmium

The temperature dependence of both the isotropic and anisotropic parts of the Knight shift in cadmium is calculated and found to be in good agreement with experiment. Lattice vibrations effectively decrease the strength of the lattice potential and make it more isotropic. As the temperature increases the energy bands become thus more free-electron-like and the $s$ character of the wave functions on portions of the Fermi surface increases. At the same time the cancellation due to different $p$ contributions in the various sheets of Fermi surface is destroyed, and the anisotropy also increases.