The formalism of nuclear spin-lattice relaxation at low temperatures is developed, leading to a new relaxation time T_μ and a straightforward method of interpreting very-low-temperature relaxation data. Data for ⁶⁰Co in Fe, Ni, and Co hosts and for ⁵⁶Co in Fe are summarized. The use of NMR in oriented nuclei for determining relaxation times is discussed, and some comments are made on the role of frequency modulation in NMR experiments with oriented nuclei.
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Bacon et al. (1972) studied this question.
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