MAGNETIC-PROPERTIES OF TDAE-C-60 AND TDAE-C-70 WHERE TDAE IS TETRAKIS(DIMETHYLAMINO)ETHYLENE
MAGNETIC-PROPERTIES OF TDAE-C-60 AND TDAE-C-70 WHERE TDAE IS TETRAKIS(DIMETHYLAMINO)ETHYLENE
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DOI：
10.1103/physrevb.47.7554
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发表时间：
1993-03-15
影响因子：
3.7
通讯作者：
ACHIBA, Y
中科院分区：
文献类型：
--
作者：
TANAKA, K;ZAKHIDOV, AA;ACHIBA, Y
用法拉第平衡磁化强度和电子自旋共振（ESR）方法研究了C60和C70与四（二甲氨基）乙烯（TDAE）配合物的磁性。已经发现，TDAE-C60和TDAE-C70都具有每个富勒烯分子约一个自由基自旋。TDAE-C_（60）在T（c）= 16.7- 17.5K范围内表现出铁磁型转变。TDAE-C60在T（c）以下出现宽而强的ESR信号，表明磁有序状态下的自由基自旋相当局限于每个C60分子上，并且是铁磁相关的。另一方面，TDAE-C70在高于4.5K的温度下不显示铁磁性。
Magnetic properties of C60 and C70 complexes with tetrakis(dimethylamino)ethylene (TDAE) have been studied based on the measurements of the Faraday-balance magnetization and the electron-spin resonance (ESR). It has been found that both TDAE-C60 and TDAE-C70 possess about one radical spin per fullerene molecule. TDAE-C60 has been confirmed to show a ferromagnetic-type transition at T(c) = 16.7-17.5 K. Appearance of a broad and intense ESR signal below T(c) for TDAE-C60 suggests that the radical spins in the magnetically ordered state are rather localized on each C60 molecule and are ferromagnetically correlated. On the other hand, TDAE-C70 does not show ferromagnetism at temperatures above 4.5 K.