Abstract
The hyperfine splitting of the ground state of terbium in a single crystal of has been studied using spin-echo NMR at 1.3 K and in fields up to 8 T. The measurements are in perfect agreement with computations including corrections for the effect of J-mixing. From the field dependence of the quadrupolar splitting we have derived the electric field gradient at the terbium nucleus: and the ratio of antishielding factors: . The value obtained for is significantly different from that measured for the insulating compound . The contributions of the spin- and orbitally polarized conduction electrons to the total hyperfine field: T and T are obtained from the field dependence of the dipolar splitting.
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