Abstract
The linear-response theory of Kubo and Tomita is used to calculate the NMR frequencies of highly polarized two-spin species coupled by an exchange interaction. It is shown that the merging of the two NMR lines due to the fluctuating exchange field becomes weaker at high polarizations. In addition, a repulsion of the two lines occurs because of the increasing coupling of the unlike spins via the mean field. The results are in good agreement with the splitting of an exchange-merged NMR line observed in thallium metal by Eska and Schuberth at very low temperatures.
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