Beltlike C60- electron spin density distribution in the organic ferromagnet TDAE-C60 -: art. no. 086402

The observed huge increase in the width of the C-13 NMR spectra of TDAE-C-60 in the middle of the ferromagnetic phase at 10 K is due to a Jahn-Teller distortion of the C-60(-) ions which becomes visible in view of the resulting changes in the Fermi contact electron-C-13 NMR shifts. The shape of the C-13 spectra allows for a direct determination of the beltlike redistribution of the unpaired electron spin density on the C-60(-) ions, which is responsible for the relatively high ferromagnetic transition temperature in this purely organic system.