Abstract
The 61 Ni spin-lattice relaxation rate, 6l Ti 1 -1 , and the Knight shift of a 91% 61 Ni enriched sample of LuNi 2 B 2 C have been measured in the normal state. It was found that 61 (T 1 T) -1 shows a Curie-Weiss like behavior, while the Knight shift has a slight temperature dependence. The hyperfine coupling constant is estimated to be 61 A = -16 kOe/μ B , which is an order of magnitude smaller than that due to the 3d-core-polarization mechanism. When the orbital term of the relaxation rate is given by the formula calculated for the tetragonal (D 2d ) symmetry at the 61 Ni sites, much larger d-spin term than that expected from the Knight shift is obtained. The Korringa relation is also discussed on the assumption that the hyperfine coupling constant is reduced by a strong s-d admixture, and then the deviation from the Korringa relation for free electrons, K(α), is more than one. This result suggests the significance of the generalized susceptibility, X(q), at finite wave vectors.
Published Version
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