The spin-lattice relaxation time T1 either in the superconducting and normal phases is investigated by the use of the Green’s function method. The lattice, in this case, means the conduction electrons and the interaction is mainly due to the Fermi contact term. Electrons and nuclei are treated on the same footing, namely both are in the second quantized form. The coherent terms are summarized in a general fashion at the beginning
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