Abstract
We present a proof of the Korringa· relation for the impurity nuclear spin-lattice relaxation of transition-metal impurities in simple metals. Two important mechanisms are considered; the relaxation due to the d-spin fluctuations and the d-orbital fluctuations. By using the 5-fold degenerate Anderson model it is shown that the Korringa relation is valid at low temperatures T<f;_Tx for these two mechanisms in any order of the Coulomb interac tion between d-electrons. The proof can be easily extended to the Korringa relation for the Wolff model.
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