Spin dynamics of the organic linear chain compounds (TMTTF)2X(X=SbF6, AsF6, BF4, ReO4, and SCN)
Spin dynamics of the organic linear chain compounds (TMTTF)2X(X=SbF6, AsF6, BF4, ReO4, and SCN)
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有机直链化合物(TMTTF)2X(X=SbF6、AsF6、BF4、ReO4和SCN)的自旋动力学
DOI：
10.1103/physrevb.83.205126
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发表时间：
2011
影响因子：
3.7
通讯作者：
M. Dressel
中科院分区：
文献类型：
--
作者：
B. Salameh;S. Yasin;M. Dumm;G. Untereiner;L.K. Montgomery;M. Dressel
我们对有机量子自旋体系（TMTTF）（AsF，BF，ReO，SCN）在380 K以下的自旋磁化率进行了全面的研究。在高温下，在恒定体积下的自旋磁化率（可以用自旋反铁磁海森堡链描述，交换常数在400 - 460 K之间）。低于K时，由于链间相互作用，与模型略有偏差。在低温下，化合物经历转变为各种有序状态的结构或磁性的起源，详细讨论。（TMTTF）AsF和（TMTTF）BF的自旋二聚基态分别可以用单重态-三重态能隙和52 K的交替自旋链来描述。然而，在（TMTTF）ReO中，阴离子有序态的自旋极化率偏离了该模型，并服从与K有关的激活定律。在（TMTTF）SbF和（TMTTF）SCN的反铁磁基态中，在最低温度下观察到自旋磁化率的增加。
We have performed a comprehensive investigation on the spin susceptibility of the organic quantum-spin systems (TMTTF)(, AsF, BF, ReO, and SCN) in the temperature range fromup to 380 K. At elevated temperatures, the spin susceptibility at constant volume (can be described by a spin-antiferromagnetic Heisenberg chain with exchange constantsbetween 400 and 460 K. BelowK, slight deviations from the model occur due to interchain interaction. At low temperatures, the compounds undergo transitions to various ordered states of structural or magnetic origin that are discussed in detail. The spin-dimerized ground states of (TMTTF)AsFand (TMTTF)BFcan be described by an alternating spin chain with a singlet-triplet energy gapand 52 K, respectively. In (TMTTF)ReO, however, the spin susceptibility in the anion-ordered state deviates from this model and obeys an activated law withK. In the antiferromagnetic ground states of (TMTTF)SbFand (TMTTF)SCN an increase of the spin susceptibility is observed at the lowest temperatures.