Comparative study of ferromagnetic and non-ferromagnetic modifications of TDAE-C60
1999
The magnetic properties of two different modifications of TDAE-C60 have been studied with the ESR and 1H NMR. Well-annealed single crystals display a transition to a ferromagnetically ordered state as confirmed by the observation of the ferromagnetic resonance. On the other hand the magnetic ground state of the non-ferromagnetic modification is consistent with the singlet ground state. The gap between the singlet and low laying triplet excited state opens below 11 K and reaches about 15 K at 5 K. A possible structural differences and their impact on the observed magnetic properties of the two modifications are discussed.
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