The nuclear spin-lattice relaxation time, T1, in superconducting cadmium has been measured in the range of 0.37°K to 0.6°K. A field-cycling method was used. The results are explained by the theory of Bardeen, Cooper, and Schrieffer, and give another confirmation of the theory. The temperature dependence of T1in cadmium is identical to that in aluminum, which is surprising in view of the different crystal symmetry and band structure of the two metals.
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Yoshika Masuda (1962) studied this question.