一维有机电荷转移盐δ-（EDT-TTF-CONMe $_2$）$_2$ Br的弛豫动力学
Relaxation dynamics in the one-dimensional organic charge-transfer salt δ-(EDT-TTF-CONMe$_2$)$_2$Br
摘要：
对电荷有序电荷转移盐δ-（EDT-TTF-CONMe $_{2}$）$_{2}$ Br的热膨胀测量和介电谱进行了详细的研究，揭示了三个弛豫特征的动态过程。最慢的一个表现出玻璃态冻结的特点，并归因于末端乙烯基团的有机分子的构象动力学。这样的过程先前被发现用于相关的电荷转移盐，然而，其中阴离子形成聚合物样链，与本发明材料的球形阴离子相反。介电谱揭示了两个额外的弛豫过程。更快的一个的特性是一致的激发的一维维格纳晶格最近在这种材料中观察到的红外光谱，这也伴随着分子的构象变化。然而，在低温下的乙烯基团的松弛表现出协同诱导的显着放缓，这是典型的玻璃冻结，而缺陷相关的维格纳晶格激发热激活行为，如预期的单偶极松弛。
英文摘要：
A detailed investigation of the charge-ordered charge-transfer salt δ-(EDT-TTF-CONMe$_{2}$)$_{2}$Br by thermal-expansion measurements and dielectric spectroscopy reveals three dynamic processes of relaxational character. The slowest one exhibits the characteristics of glassy freezing and is ascribed to the conformational dynamics of terminal ethylene groups of the organic molecules. Such a process was previously found for related charge-transfer salts where, however, the anions form polymerlike chains, in contrast to the spherical anions of the present material. Dielectric spectroscopy reveals two additional relaxational processes. The characteristics of the faster one are consistent with excitations of a one-dimensional Wigner lattice as recently observed in this material by infrared spectroscopy, which are also accompanied by conformational changes of the molecules. However, at low temperature the ethylene-group relaxation exhibits the cooperativity-induced dramatic slowing down that is typical for glassy freezing, while the defect-related Wigner-lattice excitation follows thermally activated behavior as expected for single-dipole relaxations.
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