Crossover in electrical frequency response through an insulator-metal transition

被引：85

作者：

Kohlman, RS

Joo, J

Min, YG

MacDiarmid, AG

Epstein, AJ

机构：

[1] KOREA UNIV, DEPT PHYS, SEOUL 136701, SOUTH KOREA

[2] UNIV PENN, DEPT CHEM, PHILADELPHIA, PA 19104 USA

[3] OHIO STATE UNIV, DEPT CHEM, COLUMBUS, OH 43210 USA

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 77卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.77.2766

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The insulator-metal transition (IMT) for a model quasi-one-dimensional (quasi-1D) conducting polymer (polyaniline) is probed at room temperature (RT) over an unusually broad frequency range (2 meV-6 eV) and also via T-dependent dc conductivity (sigma(dc)). We determine that the IMT is not monotonic with increasing sigma(dc)(RT). The RT far infrared scattering time (tau) becomes unusually long (greater than or equal to 10(-13) s) as sigma(dc)(RT) increases, even for samples on the insulating side of the IMT. We conclude that the IMT is due to percolation in the presence of inhomogeneous disorder and quasi-1D localization rather than 3D Anderson localization.

引用

页码：2766 / 2769

页数：4

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