Knight-Shift Calculations in Liquid Magnesium

The Knight shift $K_s$ and nuclear spin-relaxation time $T_1$ have been calculated in liquid Mg using the pseudopotential theory. The results of this calculation show that both $K_s$ and $T_{1}T$ are independent of temperature $T$ within the error in our calculation. The calculated value of $K_s$ at the melting temperature (651 ° C) is (0.10 ± 0.005)% which compares well with the recent experimental measurement (0.112 ± 0.004)% made between - 196 and 230 ° C. From this evidence, it can be concluded that there is no significant change of $K_s$ upon melting, contrary to what has been observed in Cd. The theoretical value of the Korringa ratio, $\frac{{\left(K_s^2{T}_{1}T\right)}_{\mathrm{theor}}}{{\left(K_s^2{T}_{1}T\right)}_{\mathrm{ideal}}}$, departs from its ideal value of unity by about 17%. This departure is attributed to the different role of exchange enhancement on the uniform and nonuniform spin paramagnetic susceptibilities.