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13 C-NMR experiments have been carried out in order to gain an insight into the change of the electronic state above and below the Metal-Insulator transition at around 40 K in the ammoniated füllende (NH 3 )K 3 C 60 . The antiferromagnetic ordering is unambiguously identified by both a significant increase of 13 C linewidth at low temperatures and a distinct drop...
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