Giant nonlinear conductivity in an organic conductor with a sharp metal-insulator transition: β -(BEDT-TTF)3(HSO4)2
Giant nonlinear conductivity in an organic conductor with a sharp metal-insulator transition: β -(BEDT-TTF)3(HSO4)2
复制标题
具有急剧金属-绝缘体转变的有机导体中的巨大非线性电导率：β -(BEDT-TTF)3(HSO4)2
DOI：
10.1103/physrevb.80.155106
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发表时间：
2009
影响因子：
3.7
通讯作者：
I. Terasaki
中科院分区：
文献类型：
--
作者：
T. Ozawa;K. Tamura;Y. Bando;T. Kawamoto;Takehiko Mori;I. Terasaki
标题的有机导体，其中BEDT-TTF是双（亚乙基二硫）四硫杂-富瓦烯，经历了尖锐的金属-绝缘体转变，在，低于该巨大的非线性电导率伴随着负微分电阻（NDR）观察。在通常的有机导体中，高电流区的电阻随电流的功率而减小，但本系统显示出突变的NDR。基于能量平衡的唯象理论定量地解释了这种反常的负折射率现象，并将其归因于在。这种非线性输运类型与传统的“激活”类型相反，称为“跃迁”类型。该转变类型的特征还在于阈值功率的负温度依赖性。据预测，有可能出现振荡电压，但混沌输出从来没有出现在这种类型。不同形状的双探针的电流-电压特性和脉冲响应也被解释在低导电和高导电状态的小比例。
The title organic conductor, where BEDT-TTF is bis(ethylenedithio)tetrathia-fulvalene, undergoes a sharp metal-insulator transition at, below which giant nonlinear conductivity accompanied by negative differential resistance (NDR) is observed. In the usual organic conductors, resistance in the high-current region decreases following the power of current, but the present system shows abrupt NDR. The extraordinary NDR is quantitatively explained by phenomenology based on the energy balance and attributed to the sharp phase transition at. This type of nonlinear transport is called “transition” type in contrast to the conventional “activation” type. The transition type is also characterized by the negative temperature dependence of the threshold power. It is predicted that there is a possibility that oscillating voltage emerges, but chaotic output never appears in this type. The different shapes of the two-probe current-voltage characteristics and pulse responses are also interpreted in view of the small ratio of the low-conducting and high-conducting states.