Abstract
It is shown in this paper that a structural dependence of the atomic interference function, i.e., the structure factor I(K), is of considerable importance in the study of the fractional change of the Knight shift ΔS / S (contact term) and nuclear spin relaxation time T1 with temperature in liquid metals. A perturbation expansion of the pseudowave function has been made to calculate the electron densities, where the matrix elements are expressed in terms of the pseudopotential and interference function. The predicted values of ΔS / S in liquid In, Tl, Pb, and Sn show a linear relationship with the temperature. When these results are used in the well-known Korringa relation, we get T1 values which are little higher than the experimental values. However, they compare reasonably well with those which can be obtained by using the Pines theory that is based on the many-body effect of the electrons for the spin paramagnetic susceptibility. Qualitatively, the predicted results for ΔS / S and T1 are in good agreement with the recent experimental results.
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