ed in the original Hamiltonian.For a point charge Ze the total screening charge is correctly obtained from the limit as q-+ 0 of our susceptibility: -4nZeq~2x ee (q) = -Ze, independent of the magnetization.Although Xme = Xem = 0 f°r the paramagnetic state, in the ferromagnetic case these nondiagonal susceptibilities are as important as the usual diagonal susceptibilities. If we assume that the effect of adding an impurity can be represented typically by a charge Ze and spin S interacting with the conduction electrons via an exchange interaction J(s-d interaction), then the total spin polarization induced in the medium due to the charge and the spin are given, respectively, by ~ZII B where for typical values of Z and S these two contributions are on the same order of magnitude. Recently neutron-diffraction experiments 12 and Mossbauer experiments 13 revealed a rather complicated behavior for the spin and charge polarization around impurities in ferromagnetic metals and some attempts were made to analyze this behavior theoretically. 2 We believe our results offer a sound basis for this kind of analysis.We would especially like to thank Professor J. R. Schrieffer for discussions related to Xmm (#)• These discussions helped stimulate our present work.

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