NMR measurements show an unusually strong RKKY coupling between niobium nuclei in Nb3Sn, making nuclear spin coherence about 20 times longer than dipolar coupling alone would allow.
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Nuclear spin coherence in superconducting Nb$_3$Sn
NMR measurements show an unusually strong RKKY coupling between niobium nuclei in Nb3Sn, making nuclear spin coherence about 20 times longer than dipolar coupling alone would allow.