Metallic states of PF6-doped polypyrroles at low temperature

被引：0

作者：

Kaneko, H. ^{[1
]}

Ishiguro, T. ^{[1
]}

Sato, K. ^{[1
]}

Hagiwara, T. ^{[1
]}

Yamaura, M. ^{[1
]}

Nishiyama, H. ^{[1
]}

Ishimoto, H. ^{[1
]}

机构：

[1] Kyoto Univ, Kyoto, Japan

来源：

Synthetic Metals | 1993年 / 55卷 / 2 -3 pt 2期

关键词：

Aromatic polymers - Band structure - Charge carriers - Doping (additives) - Electric conductivity - Electron energy levels - Low temperature effects - Mathematical models - Microwave spectroscopy - Phosphorus compounds - Scattering - Thermoelectricity;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The electrical resistivity of conducting PF6-doped polypyrroles exhibiting resistance maximum near 15 K was measured down to 1 mK. The thermoelectric power was almost proportional to temperature, while ESR measurements exhibited temperature-independent paramagnetic spin concentration of the order of 1.1×1021 per mole of pyrrole rings. We propose a conduction model in relation to the spin concentration. The resistance maximum may be ascribed to crossover from hopping conduction to coherent motion. The logarithmic temperature dependence below 1 K is ascribed to scattering of conduction carriers by centers with internal degrees of freedom as in amorphous metal alloys.

引用

页码：1102 / 1107

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