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A pseudopotential calculation of the Knight shift in simple metals

The authors calculate the Knight shift K in simple metals using a general expression for K and pseudopotential techniques. K is expressed as the sum K=Ks+Ko+Kso, where Ks, Ko and Kso are the spin, orbital and spin-orbit contributions to the Knight shift, respectively. Many-body and spin-orbit interactions are considered and their importance is emphasized. Metals with different crystal structures are considered. Results of the present calculations are compared with those obtained in some recent works. In contrast to other calculations, the authors obtain good to excellent agreement with experimental results in most of the cases. A remarkable feature of the authors' results is the explanation of the negative Knight shift in beryllium. The fact that the theory explains the Knight shift in several metals suggests that various important mechanisms are accounted for adequately.