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Abstract
A general theory of spin relaxation in metals is developed: It is valid for any temperature domain and also for arbitrary magnitude I of a relevant nuclear spin. A multiple-time relaxation process for I ≥1 is completely determined on a microscopic ground. Though the multiple character of the relaxation process for the first moment reveals itself only at low temperatures and/or high magnetic field, it is essential for the fluctuations even at high temperature domain. At very low temperatures, the relaxation times saturate in contrast to behaviors given by the Korringa relation and a new phenomenon “relaxation-time-maximum” is found as a function of inverse temperature. A discussion is given to the related experiments. Effects of spin wave excitations on the relaxation process are also discussed.
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