Lattice structure of the fullerene ferromagnet TDAE–C60
Lattice structure of the fullerene ferromagnet TDAE–C60
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DOI：
10.1038/355331a0
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发表时间：
1992
期刊：
影响因子：
64.8
通讯作者：
P. Stephens;D. Cox;J. Lauher;L. Mihály;J. Wiley;P. Allemand;A. Hirsch;K. Holczer;Q. Li;J. Thompson;F. Wudl
中科院分区：
文献类型：
--
作者：
P. Stephens;D. Cox;J. Lauher;L. Mihály;J. Wiley;P. Allemand;A. Hirsch;K. Holczer;Q. Li;J. Thompson;F. Wudl
自从提纯C60凝聚相的技术发展以来（参考文献1,2），在很短的时间内，已经合成了具有超导性3,4和铁磁性等重要固态特性的C60化合物。c60分子参与这两种完全不同的作用这一事实本身就令人震惊；此外，c60基材料在所有分子有机铁磁性材料中具有最高的tc。要了解这种铁磁性的物理起源，肯定需要了解晶体结构。本文报道了铁磁体TDAE - c60的x射线衍射研究，其中TDAE是四（二甲氨基）乙烯，C2N4(CH3)8。结果表明，TDAE与C60的比例为1:1，其组成符合化学计量学。该结构具有以交流为中心的单斜胞，具有各向异性的低维带结构。任何关于铁磁行为的理论都必须考虑到这种各向异性。
IN the brief time since the development of techniques for the purification of condensed phases of C60(refs 1, 2), compounds of C60have been synthesized that exhibit the important solid-state properties of superconductivity3,4and ferromagnetism5. The fact that the C60molecule participates in these two disparate effects is in itself striking; furthermore, the C60-based material has the highestTcof 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 ac-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.