Abstract
IN the brief time since the development of techniques for the purification of condensed phases of C60 (refs 1, 2), compounds of C60 have been synthesized that exhibit the important solid-state properties of superconductivity3,4 and ferromagnetism5. The fact that the C60 molecule participates in these two disparate effects is in itself striking; furthermore, the C60-based material has the highestTc of any molecular organic ferromagnet6. An understanding of the physical origin of this ferromagnetism is sure to require a knowledge of the crystal structure. Here we report on an X-ray diffraction study of the ferromagnet TDAE–C60, where TDAE is tetrakis(dimethylamino)ethylene, C2N4(CH3)8. We find that the composition is stoichiometric with 1:1 ratio of TDAE to C60. The structure has a c-centred monoclinic unit cell suggestive of an anisotropic, low-dimensional band structure. Any theory for the ferromagnetic behaviour will have to take this anisotropy into account.
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Stephens, P., Cox, D., Lauher, J. et al. Lattice structure of the fullerene ferromagnet TDAE–C60. Nature 355, 331–332 (1992). https://doi.org/10.1038/355331a0
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DOI: https://doi.org/10.1038/355331a0
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