Field- and frequency dependent transport in the two-dimensional organic conductor α-(BEDT-TTF)2I3
Field- and frequency dependent transport in the two-dimensional organic conductor α-(BEDT-TTF)2I3
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二维有机导体 α-(BEDT-TTF)2I3 中场和频率相关的输运
DOI：
10.18419/opus-4871
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
D. Schweitzer
中科院分区：
文献类型：
--
作者：
M. Dressel;G. Grüner;J. Pouget;A. Breining;D. Schweitzer
标题化合物在TMI = 135 K发生了一个未知原因的金属-绝缘体相变。我们研究了Q-（BEDT-TTFhh）在宽频率范围内的电动力学响应，包括微波和毫米波频率以及光谱范围，并发现在低温相的电导率高达1000 cm- 1。这是伴随着一个非线性的传输，在约10 V fcm的平滑开始。我们的X射线研究没有显示出超结构反射的迹象，并明确排除了电荷密度波基态的形成。在20 K和100 K之间的毫米波电导率中缺乏温度依赖性使得跳跃传输不太可能。
The title compound undergoes a metal-insulator phase transition of unknown origin at TMI = 135 K. We studied the electrodynamic response of Q-(BEDT-TTFhh in a wide range of frequency, covering microwave and millimeter wave frequencies as weIl as the optical spectral range, and found a frequency dependent conductivity up to 1000 cm- 1 in the low temperature phase. This is accompanied be a non-linear transport with a smooth onset at about 10 V fcm. Our X-ray studies show no indication of superstructure reflections and clearly rule out the formation of a charge density wave ground state. The lack of a temperature dependence in the millimeter wave conductivity between 20 K and 100 K makes hopping transport unlikely.