Temperature Dependences of the Magnetic Susceptibilities of Liquid Cs

The temperature dependence of the electronic magnetic susceptibilities of liquid caesium metal is investigated using a full nonlocal pseudopotential theory. A notable feature of the present theory is that it incorporates a highly reliable Generalised Nonlocal Model Pseudopotential formfactor and a liquid structure factor determined self-consistently from the Monte Carlo technique. In contrast to recent calculations by Shimokawa et al, the theoretical results presented show that the ion-potential alone is less effective in explaining the observed variation of electronic magnetic susceptibility with temperature. Instead we discover that the temperature effects of exchange-correlation of conduction electrons on the electronic magnetic susceptibility have to be considered seriously. A method, which combines the Landau theory of Fermi liquid, the theories of jellium susceptibility and the theoretical calculation of density-of-states effective mass, are proposed to estimate such temperature corrections of exchange-correlation. When the latter and the contribution from ion-potential are both incorporated in the theory, satisfactory agreement between theory and experiments is obtained. A brief discussion of the presently calculated electronic effective mass and Landau scattering coefficient and their relation to the Knight shift in metal is given. The temperature effect on the Knight shift of Cs is inferred from the analysis.