Abstract
It has been established earlier that the 19F NMR shift is positive in the first half of the group of rare-earth trifluorides and negative in the second half of the group—a fact which suggests that the shift is proportional to the thermal average of the rare-earth spin. We have studied the 19F NMR in SmF 3 in the temperature range of 300° to 1.3°K. Though Sm belongs to the first half, the 19F shift is negative throughout the temperature range. It is suggested that the anomalous behavior in SmF 3 may be due to the effect of strong crystalline fields on the spin average of Sm 3+ ion.
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