Abstract
We report on the application of the Green's function method to problems of the hyperfine interaction in metallic systems, which permitted us to find very convenient expressions for the magnetic nuclear spin lattice time as well as for the contact and the orbital contributions to the Knight shift. The great advantage of this approach is that it is not only applicable to pure metals, but also, e.g. within the Korringa-Kohn-RostokerCoherent Potential Approximation (KKR-CPA), to disordered alloys. Because it has turned out that relativistic effects can be important even for relatively light elements such as Ag, our approach has been extended by using the relativistically correct single particle Green's function to account properly for these effects.
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