Crossover to negative dielectric response in the low-frequency spectra of metallic polymers

被引：47

作者：

Lee, KH ^{[1
]}

Heeger, AJ

机构：

[1] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea

[2] Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW B | 2003年 / 68卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.68.035201

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report high-precision reflectance, R(omega), measurements on films of conducting polypyrrole oriented by tensile drawing. The results obtained from Kramers-Kronig analysis of R(omega) demonstrate that the optical conductivity, sigma(omega), becomes frequency-independent below approximately 250 cm(-1) and that there is a zero crossing in the dielectric function, epsilon(omega), to negative values below 20 cm(-1). Since sigma(omega) extrapolates to the dc value and since epsilon(omega) is in excellent agreement with the data obtained from terahertz and microwave measurements, the controversy in the dielectric response of the metal physics of conducting polymers is finally resolved.

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