Specific heat and spin susceptibility of dilute alloys*

The change in the specific heat and spin susceptibility of a metal of valence Z due to the introduction of a small number of impurity atoms with valence (Z + q) is calculated by the Thomas-Fermi method. It is shown that in the case of copper an exact Thomas-Fermi calculation accounts approximately for the seemingly linear behaviour of the change in C_v and X from q = 1 to q = 3 observed in recent experiments by Rayne. It does not, however, account for absolute values. In an appendix a check on the validity of the Thomas-Fermi theory is made for q < 1 by recalculating the specific heat and spin susceptibility by means of the techniques of many-body perturbation theory. The different methods give essentially the same results.